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PLC Control Systems –
Final Report
ELR223
2015
SeanForbes& CodyBougie
Instructor:Ron Chartrand
4/19/2015

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Table of Contents
Table of Contents............................................................................................................................ 1
Table of Figures............................................................................................................................... 5
Table of Tables................................................................................................................................ 7
Lab 8A.............................................................................................................................................. 8
Introduction................................................................................................................................. 9
Ladder Logic .............................................................................................................................. 10
I/O Listing .................................................................................................................................. 11
Hardware AutoCAD Drawing..................................................................................................... 12
Summary ................................................................................................................................... 13
Lab 8B............................................................................................................................................ 14
Introduction............................................................................................................................... 15
Ladder Logic .............................................................................................................................. 17
I/O Listing .................................................................................................................................. 18
Hardware AutoCAD Drawing..................................................................................................... 19
Summary ................................................................................................................................... 20
Lab 9A............................................................................................................................................ 21
Introduction............................................................................................................................... 22
Ladder Logic .............................................................................................................................. 23
I/O Listing .................................................................................................................................. 24
Hardware AutoCAD Drawing..................................................................................................... 25
Summary ................................................................................................................................... 26
Lab 9B............................................................................................................................................ 27
Introduction............................................................................................................................... 28
Ladder Logic .............................................................................................................................. 29
I/O Listing .................................................................................................................................. 30
Hardware AutoCAD Drawing..................................................................................................... 31
Summary ................................................................................................................................... 32
Lab 10............................................................................................................................................ 33
Introduction............................................................................................................................... 34
Ladder Logic .............................................................................................................................. 35
I/O Listing .................................................................................................................................. 36

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Hardware AutoCAD Drawing..................................................................................................... 37
Summary ................................................................................................................................... 38
Lab 11A.......................................................................................................................................... 39
Introduction............................................................................................................................... 40
Ladder Logic .............................................................................................................................. 41
I/O Listing .................................................................................................................................. 42
Hardware AutoCAD Drawing..................................................................................................... 43
Summary ................................................................................................................................... 44
Lab 11B.......................................................................................................................................... 45
Introduction............................................................................................................................... 46
Ladder Logic .............................................................................................................................. 47
I/O Listing .................................................................................................................................. 48
Hardware AutoCAD Drawing..................................................................................................... 49
Summary ................................................................................................................................... 50
Lab 12A.......................................................................................................................................... 51
Introduction............................................................................................................................... 52
Ladder Logic .............................................................................................................................. 53
I/O Listing .................................................................................................................................. 55
Hardware AutoCAD Drawing..................................................................................................... 56
Summary ................................................................................................................................... 57
Lab 12B.......................................................................................................................................... 58
Introduction............................................................................................................................... 59
Ladder Logic .............................................................................................................................. 61
I/O Listing .................................................................................................................................. 64
Hardware AutoCAD Listing........................................................................................................ 65
Summary ................................................................................................................................... 66
Lab 12C.......................................................................................................................................... 67
Introduction............................................................................................................................... 68
Ladder Logic .............................................................................................................................. 69
I/O Listing .................................................................................................................................. 72
Hardware AutoCAD Drawing..................................................................................................... 73
Summary ................................................................................................................................... 74

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Lab 12D ......................................................................................................................................... 75
Introduction............................................................................................................................... 76
Ladder Logic .............................................................................................................................. 78
I/O Listing .................................................................................................................................. 81
Hardware AutoCAD Drawing..................................................................................................... 82
Summary ................................................................................................................................... 83
Lab 13A.......................................................................................................................................... 84
Introduction............................................................................................................................... 85
Ladder Logic .............................................................................................................................. 87
I/O Listing .................................................................................................................................. 89
Hardware AutoCAD Drawing..................................................................................................... 90
Summary ................................................................................................................................... 91
Lab 13B.......................................................................................................................................... 92
Introduction............................................................................................................................... 93
Sequencer Setup.................................................................................................................... 95
Ladder Logic .............................................................................................................................. 96
I/O Listing .................................................................................................................................. 97
Hardware AutoCAD Drawing..................................................................................................... 98
Summary ................................................................................................................................... 99
Lab 14A........................................................................................................................................ 100
Introduction............................................................................................................................. 101
Ladder Logic ............................................................................................................................ 103
I/O Listing ................................................................................................................................ 105
Hardware AutoCAD Drawing................................................................................................... 106
Summary ................................................................................................................................. 107
Lab 14B........................................................................................................................................ 108
Introduction............................................................................................................................. 109
Ladder Logic ............................................................................................................................ 111
I/O Listing ................................................................................................................................ 113
Hardware AutoCAD Drawing................................................................................................... 114
Summary ................................................................................................................................. 115
Lab 14C........................................................................................................................................ 116

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Introduction............................................................................................................................. 117
Sequencer Setup.................................................................................................................. 118
Ladder Logic ............................................................................................................................ 119
I/O Listing ................................................................................................................................ 120
Hardware AutoCAD Drawing................................................................................................... 121
Summary ................................................................................................................................. 122
Lab 15A........................................................................................................................................ 123
Introduction............................................................................................................................. 124
Ladder Logic ............................................................................................................................ 125
I/O Listing ................................................................................................................................ 126
Hardware AutoCAD Drawing................................................................................................... 127
Summary ................................................................................................................................. 128
Lab 15B........................................................................................................................................ 129
Introduction............................................................................................................................. 130
Ladder Logic ............................................................................................................................ 131
I/O Listing ................................................................................................................................ 132
Hardware AutoCAD Drawing................................................................................................... 133
Summary ................................................................................................................................. 134
Lab 15C........................................................................................................................................ 135
Introduction............................................................................................................................. 136
Ladder Logic ............................................................................................................................ 138
I/O Listing ................................................................................................................................ 139
Hardware AutoCAD Drawing................................................................................................... 140
Summary ................................................................................................................................. 141
Appendix ..................................................................................................................................... 142
Timer Instruction..................................................................................................................... 142
Up Counter Instruction............................................................................................................ 144
Sequencer Output Instruction................................................................................................. 147
References................................................................................................................................... 152

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Table of Figures
Figure 1 Lab 8A Ladder Logic...................................................................................................... 10
Figure 2 Hardware Layout of Lab 8A........................................................................................... 12
Figure 3 Lab 8B Ladder Logic....................................................................................................... 17
Figure 4 Hardware Layout for Lab 8B........................................................................................ 19
Figure 5 Lab 9A Ladder Logic...................................................................................................... 23
Figure 6 Hardware Layout for Lab 9A......................................................................................... 25
Figure 7 Lab 9B Ladder Logic...................................................................................................... 29
Figure 8 Hardware Layout for Lab 9B......................................................................................... 31
Figure 9 Lab 10 Ladder Logic...................................................................................................... 35
Figure 10 Hardware Layout for Lab 10....................................................................................... 37
Figure 11 Lab 11A Ladder Logic.................................................................................................. 41
Figure 12 Hardware Layout for Lab 11A .................................................................................... 43
Figure 13 Lab 11B Ladder Logic.................................................................................................. 47
Figure 14 Hardware Layout for Lab 11B..................................................................................... 49
Figure 15 Lab 12A Ladder Logic (1)............................................................................................ 53
Figure 16 Lab 12A Ladder Logic (2)............................................................................................ 54
Figure 17 Hardware Layout for Lab 12A .................................................................................... 56
Figure 18 Lab 12B Ladder Logic (1)............................................................................................ 61
Figure 19 Lab 12B Ladder Logic (2)............................................................................................ 62
Figure 20 Lab 12B Ladder Logic (3)............................................................................................ 63
Figure 21 Hardware Layout for Lab 12B..................................................................................... 65
Figure 22 Lab 12C Ladder Logic (1)............................................................................................ 69
Figure 23 Lab 12C Ladder Logic (2)............................................................................................ 70
Figure 24 Lab 12C Ladder Logic (3)............................................................................................ 71
Figure 25 Hardware Layout for Lab 12C..................................................................................... 73
Figure 26 Lab 12D Ladder Logic (1)............................................................................................ 78
Figure 27 Lab 12D Ladder Logic (2)............................................................................................ 79
Figure 28 Lab 12D Ladder Logic (3)............................................................................................ 80
Figure 29 Hardware Layout for Lab 12D .................................................................................... 82
Figure 30 Lab 13A Ladder Logic (1) ............................................................................................ 87
Figure 31 Lab 13A Ladder Logic (2) ............................................................................................ 88
Figure 32 Hardware Layout for Lab 13A .................................................................................... 90
Figure 33 Array for Sequencer Control ...................................................................................... 95
Figure 34 Lab 13B Ladder Logic.................................................................................................. 96
Figure 35 Hardware Layout for Lab 13B..................................................................................... 98
Figure 36 Lab 14A Ladder Logic (1) .......................................................................................... 103
Figure 37 Lab 14A Ladder Logic (2) .......................................................................................... 104

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Figure 38 Hardware Layout for Lab 14A .................................................................................. 106
Figure 39 Lab 14B Ladder Logic (1) .......................................................................................... 111
Figure 40 Lab 14B Ladder Logic (2) .......................................................................................... 112
Figure 41 Hardware Layout for Lab 14B................................................................................... 114
Figure 42 Array for Sequencer Control .................................................................................... 118
Figure 43 Lab 14C Ladder Logic................................................................................................ 119
Figure 44 Hardware Layout for Lab 14C................................................................................... 121
Figure 45 Examples of RSView 32 Software Menus ................................................................. 124
Figure 46 Lab 15A Ladder Logic................................................................................................ 125
Figure 47 Example of A Motor Running (Green) and of A Motor Not Running (Red)............. 125
Figure 48 Example of RSView 32 Window; Where Tags Are Created and Matched With Their
Corresponding ‘Tag’ In The RSlogix 5000 Program (One Motor) ............................................... 126
Figure 49 Hardware Layout for Lab 15A .................................................................................. 127
Figure 50 Lab 15B Ladder Logic................................................................................................ 131
Figure 51 Example of Three Motors Running (Green) and Three Motors Not Running (Red) 131
Figure 52 Example of RSView 32 Window; Where Tags Are Created and Matched With Their
Corresponding ‘Tag’ In The RSLogix 5000 Program (Three Motors) .......................................... 132
Figure 53 Hardware Layout for Lab 15B................................................................................... 133
Figure 54 Example of Trending Window in RSLogix 5000........................................................ 136
Figure 55 Lab 15C Ladder Logic................................................................................................ 138
Figure 56 Hardware Layout for Lab 15C................................................................................... 140

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Table of Tables
Table 1 I/O Table for Lab 8A........................................................................................................ 11
Table 2 I/O Table for Lab 8B........................................................................................................ 18
Table 3 I/O Table for Lab 9A........................................................................................................ 24
Table 4 I/O Table for Lab 9B........................................................................................................ 30
Table 5 I/O Table for Lab 10........................................................................................................ 36
Table 6 I/O Table for Lab 11A...................................................................................................... 42
Table 7 I/O Table for Lab 11B...................................................................................................... 48
Table 8 I/O Table for Lab 12A...................................................................................................... 55
Table 9 I/O Table for Lab 12B...................................................................................................... 64
Table 10 I/O Table for Lab 12C................................................................................................... 72
Table 11 I/O Table for Lab 12D................................................................................................... 81
Table 12 I/O Table for Lab 13A................................................................................................... 89
Table 13 I/O Table for Lab 13B................................................................................................... 97
Table 14 I/O Table for Lab 14A................................................................................................. 105
Table 15 I/O Table for Lab 14B................................................................................................. 113
Table 16 I/O Table for Lab 14C................................................................................................. 120
Table 17 I/O Table for Lab 15A................................................................................................. 126
Table 18 I/O Table for Lab 15B................................................................................................. 132
Table 19 I/O Table for Lab 15C................................................................................................. 139

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Lab8A Three Motor Start
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

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Introduction
The objective of lab 8A was to design a program on the PLC programming software that would
be able to turn on three motors once the corresponding start button was pressed. The program
will allow any of the three motors to be turned on and turned off in any order that the user
chooses. In addition the program must contain a master stop button that will be able to stop all
the motors at the same time when pressed. Given the demands of the program we decided it
would be best if each motor was placed on its own rung since each motor required its own start
and stop button. Firstly we started by creating a “master stop” on each rung aliased to the same
button, thus enabling the user to shut down all the motors at once in the event of an emergency.
There is a total of three master stop buttons in the finished program, but only one physical master
stop button, each master button was programmed as a normally open (Examine On) contact;
However the master stop button was wired as a normally closed (Examine Off) contact. Another
stop button was added to each rung so the user could turn off each motor separately without
affecting any of the other motors running. Each of these stop buttons were programmed as a
normally closed contact and were aliased to separate inputs. All three start buttons have a contact
that is in parallel with the button, this contact energizes once the start button is pressed and
allows the whole rung to remain energized. The three start buttons were programmed as
normally open (Examine On) contacts were aliased to separate inputs. The motors (outputs) are
located at the end of the rung so when the contact energizes the motor will also energize. Each
motor was also aliased to separate outputs. In this lab the outputs were connected to three
separate lights that represent the motors. With the above programmed properly, this program
allows the user to run and stop any of the three motors at any time.

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Ladder Logic
Figure 1 Lab 8A Ladder Logic

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I/O Listing
Table 1 I/O Table for Lab 8A
Inputs Outputs
Local:3:I.Data.1 (Master_Stop) Local:4:O.Data.1 (Motor1_Run)
Local:3:I.Data.2 (Motor1_Stop) Local:4:O.Data.2 (Motor2_Run)
Local:3:I.Data.3 (Motor1_Start) Local:4:O.Data.3 (Motor3_Run)
Local:3:I.Data.4 (Motor2_Stop)
Local:3:I.Data.5 (Motor2_Start)
Local:3:I.Data.6 (Motor3_Stop)
Local:3:I.Data.7 (Motor3_Start)

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Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 2 Hardware Layout of Lab 8A

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Summary
This lab was a good introduction to basic ladder logic PLC programming. By starting with a lab
that required us to create a program that would allow us to start and stop three motors separately
we were able to quickly learn how each instruction can affect the outcome and operation of a
program. Lab 8A required us to create a program that will start and stop three motors separately,
while using an emergency stop to stop all motors in case of an emergency. By placing the motors
on separate rungs we were able to accomplish the task of starting and stopping each motor
separately.
During the course of this lab, we learned that even though the program shows the stops as
Normally Open contacts; that they have to be wired as Normally Closed contacts to allow the
program to operate as intended. Having the stops wired as Normally Closed (Examine Off)
contacts we are ensuring that when the emergency stop or stops are pressed they cut all power
off that is flowing into the system/ motor. When the emergency stop or stops are pressed, the
contacts open; sending a logic zero into the system. This is safety feature due to the fact we are
not energizing the stops to have them turn off equipment.
In conclusion, this lab allowed us to learn basic instructions in ladder logic that can be used to
accomplish simple tasks like starting and stopping three motors.

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Lab 8B Three Interlock Motor
Start

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Introduction
The objective of Lab 8B was to design a program on the PLC programming software that would
allow the user to turn on three motors only if the previous motor is energized. Therefore this
program will allow motor one to be turned on at any time the user choses by pressing the start
button for motor one. However motor two and three cannot be turned on at any time. Motor two
will not be able to energize unless motor one is running and motor three will not be able to turn
on unless both motor one, and two are energized. We found that this program can be designed by
simply adding and aliasing a few contacts to the lab 8A program. The first rung was left alone
because no changes needed to be made to energize motor one. To prevent motor two from being
able to start at any time and only after motor one was running we added just one normally open
(Examine On) contact before the start button of motor two. This contact was then aliased to the
energizing contact of the motor one start button thus we can now see that if that contact is not
energized, motor one will not be running and motor two will not be able to run. This same idea
was implemented to rung two. Two contacts were added so motor three would not be able to be
turned on unless motor two and motor one were running. One contact was aliased to the
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

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energizing contact of the motor one start button and the other contact was aliased to the
energizing contact of the motor two start button. With the above programmed properly, this
program will only allow the user to start each motor in numerical order and the stopping of one
motor will also cause any sub sequential motors to also stop.

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Ladder Logic
Figure 3 Lab 8B Ladder Logic

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I/O Listing
Table 2 I/O Table for Lab 8B
Inputs Outputs
Local:3:I.Data.1 (Master_Stop) Local:4:O.Data.1 (Motor1_Run)
Local:3:I.Data.2 (Motor1_Stop) Local:4:O.Data.2 (Motor2_Run)
Local:3:I.Data.3 (Motor2_Stop) Local:4:O.Data.3 (Motor3_Run)
Local:3:I.Data.4 (Motor3_Stop)
Local:3:I.Data.5 (Motor1_Start)
Local:3:I.Data.6 (Motor2_Start)
Local:3:I.Data.7 (Motor3_Start)

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Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 4 Hardware Layout for Lab 8B

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Summary
This lab required us to start three motors like lab 8A, but motor two and three couldn’t start
without motor one being already energized. This allowed us to learn how to disable motors we
did not want to start without another motor already running. We were able to accomplish this
requirement by implementing a contact from motor one, on the same rung as motor two. This
would only allow motor two to start once motor one is already energized. We accomplished the
same task for motor three by adding two contacts on the same rung as motor three. One contact
from motor one and the other from motor two. This would only allow motor three to start once
motor one and two were both energized and running.
We soon realized that this was easier said than done with our minimum experience at the time.
After some thinking we realized we had to add Normally Open contacts (aliased to a previous
motor) on the rung of a motor we did not want to start until the previous motor was energized
and running. This proved to be hard to follow at first, but eventually made sense once we had the
program operating as it was intended to.
In conclusion, this lab allowed us to apply our knowledge we gained from lab 8A by having to
start three motors; only this time motor one had to be energized before motor two could start, and
motor one and two had to be energized before motor three could start.

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Lab 9A Forward & Reversing
Motor
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

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Introduction
The objective of Lab 9A was to design a program on the PLC programming software that would
allow the user to run a single motor in the forward direction and in the reverse direction. The
program will not allow for instantaneous forward and reverse switching and the stop push button
must be pushed in order to run the motor in the opposite direction. Given the requirements for
the program we saw that we needed to interlock a total of four contacts and only two rungs
would need to be utilized. The first rung we set up for the forward operation of the motor such
that when the normally open start button was pressed, and the energizing contact located in
parallel with the start button would energize and the motor would energize and run in the
forward direction. The reverse operation was set up almost identically. By adding a normally
closed contact on both rungs and interlocking them with the energizing contacts on the opposite
rungs such as the energizing contact on rung one was aliased with a normally closed contact on
rung one and the energizing contact on rung one was aliased with a normally closed contact on
rung 0 we can prevent both rungs being energized at the same time (which would burn out the
contacts) and only allow the motor to run in one direction unless the rung was de-energized first.
For example when the start push button is pushed and the energizing contact energizes, the
normally closed contact on the opposite rung will open disabling that rung until the energizing
contact is de-energized. With the above programmed properly, this program will allow the user
to run a motor in the forward direction or reverse direction but will not allow the user to switch
directions instantaneously.

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Ladder Logic
Figure 5 Lab 9A Ladder Logic

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I/O Listing
Inputs Outputs
Local:3:I.Data.0 (Master_Stop) Local:4:O.Data.0 (Motor_Run_FWD)
Local:3:I.Data.1 (Motor_FWD) Local:4:O.Data.1 (Motor_Run_REV)
Local:3:I.Data.2 (Motor_REV)
Table 3 I/O Table for Lab 9A

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Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 6 Hardware Layout for Lab 9A

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Summary
This lab required us to start one motor in either the forward direction or reverse direction. Once
the motor was operating in one direction, the motor was not able to instantaneously switch
directions. This was accomplished by having a normally closed contact aliased to the sealing
contacts of the opposite directions on each rung (Rung 0 was aliased to the reverse direction,
Rung 1 was aliased to the forward direction). Upon completion of this lab, we were able to learn
and gain experience in the importance of interlocking motors.
As we started to progress through the lab, we soon hit a road block. This problem came about
when we realized that we cannot have the same output on two different rungs. Once we realized
we had to use to two different outputs to simulate the forward direction and reverse direction we
soon had another problem. This problem was created when we could start the ‘motor’ in both the
forward and reverse directions at the same time! Although this is an easily spotted error, we still
had to figure out how we were going to utilize instructions to interlock the two directions so the
stop button must be pressed before we are able to switch directions. After playing around with a
few different ideas we soon realized we must alias a normally closed contact (on the forward
rung) to the sealing contact of the reverse direction start button. The same thing was
accomplished on the reverse rung, where we had a normally closed contact aliased to the sealing
contact of the forward direction.
In conclusion, this lab was a great learning experience due to the fact we had to do some
troubleshooting to allow the program to operate as we were required.

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Lab 9B Instant Forward &
Reversing a Motor
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

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Introduction
The objective of Lab 9B was to design a program on the PLC programming software that wold
allow the user to run a single motor in the forward direction and in the reverse direction with
instantaneous switching. Warning: switching the direction of a motor instantaneously may be
hazardous and could damage the motor and process. Allowing the motor to switch directions
instantaneously, two changes can be made to the configuration of Lab 9A. Given the
requirements for the program we saw that by interlocking the push buttons and the normally
closed contacts (instead of the energizing contacts) on the opposite rungs we could switch the
direction of the motor in a push of a button. If the motor is running in the forward direction and
the user wished to run the motor in the reverse direction, the user would simply press the reverse
start button. By pushing the reverse start push button, the interlocked normally closed contact on
the forward operation rung will open, momentarily breaking the circuit, de-energizing the
energizing contact.

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Ladder Logic
Figure 7 Lab 9B Ladder Logic

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I/O Listing
Table 4 I/O Table for Lab 9B
Inputs Outputs
Local:3:I.Data.0 (Master_Stop) Local:4:O.Data.0 (Motor_Run_FWD)
Local:3:I.Data.1 (Motor_FWD) Local:4:O.Data.1 (Motor_Run_REV)
Local:3:I.Data.2 (Motor_REV)

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Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 8 Hardware Layout for Lab 9B

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Summary
This lab required us to go one step further with the knowledge we gained from lab 9A by
requiring us to be able to switch directions instantaneously. This was accomplished by having a
normally closed contact aliased to the opposing start button. Rung 0 had a contact that was
aliased to the reverse start button, while rung 1 had a contact aliased to the forward start button.
Upon completion of this lab, we would realize that this method of changing directions is not very
practical due to the harm it can do to a motor or system.
As we began to setup the program we quickly realized it was very similar to lab 9A, but a new
problem had arisen. We got to the point where we could start the ‘motor’ in both directions at the
same time (again)! Although we had this error occur in the previous lab, we still had to figure out
a way to use instructions to interlock the two directions. Using our knowledge we had gained
from lab 9A, we quickly thought of a method that should allow us to disable the reverse rung
when we press the forward start button, and vice versa. Once we seen this method working
(normally closed contacts aliased to the opposing stat button), we started to become curious as to
why this method is harmful to motors and other equipment. With some research and guidance,
we learn that this method is bad due to the fact that during the time of switching directions, the
CEMF is combined with the now reversed power supply. This allows for more voltage, which
means more current, which means the motor has to deal with nearly 20 times the rated current
rating of the motor. This could ultimately break the motor and/or other components in the
system.
In conclusion, this lab was a great learning experience due to the fact we learned another way of
interlocking, and how some methods are better than others.

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Lab 10 Push On / Push Off
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

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Introduction
The objective of thislabwasto designaprogram on the PLC programmingsoftware thatwouldallow
the userto start a simple flasherprogram.Thismeansthatas soonas the start push buttonhasbeen
pressedthatoutputof the programwill flashonandoff. As seeninthe ladderlogicthislabrequiresthat
the program musthave a one-shot(ONS).The one-shotislocatedonrung1 andit has the sole purpose
of keepingthe “Flip/FlopTrigger”outputON foronly one scan.Therefore once the one-shotsendsa
pulse tothe “Digital Memory”sealingcontacton rung 1, a “Digital Memory”contact on rung 2 will
energize andclose andturnon the Light(Digital Output).Since there isanormallyclosedlightcontact
aliasedtothe output,whenthe lightenergizesthe normallyclosedcontactwill opencausingthe lightto
turn off.Atthispointintime the parallel branchonrung 2 will energize;the “Digital Memory”normally
closedcontactwill re-close andthe normallyopencontactalsoaliasedtothe lightwillenergize when
the lightisON.Therefore,whenthe normallyclosed“DigitalOutput”contactopens,the normallyopen
contact closescausingthe lighttoflashON.Thisprocesswill repeateverytime the one-shotonrungone
pulse the “Digital Memory”output.Withall of the above programmedproperlythisprogramwill allow
the userto start a simple flashercircuit.

36. FINAL
35
Ladder Logic
Figure 9 Lab 10 Ladder Logic

37. FINAL
36
I/O Listing
Table 5 I/O Table for Lab 10
Inputs Outputs Internal Inputs
Local:3:I.Data.0 (Digital_Input) Local:4:O.Data.1 (Digital_Memory) One_Shot
Local:4:O.Data.2 (Digital_Output)

38. FINAL
37
Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 10 Hardware Layout for Lab 10

39. FINAL
38
Summary
This lab required us to create a program that will allow us to turn and output on/off every time
the digital input is pressed. This was accomplished by utilizing a one-shot instruction. The one-
shot instruction allows us simulate a pulse every time the digital input is pressed. These pulses
cause changes to the digital memory output, which then toggle the digital output when the rung
is energized. Upon completion of this lab, we were curious to see how this circuit would operate
on its own (Lab 11B).
As the lab progressed, we realized we didn’t fully understand how the circuit was actually
accomplishing the task of switching the output on and off. After reading the description in the
text book and doing some research on the one-shot instruction we quickly realized what we were
missing in the operation of the circuit. The one-shot instruction remembers the value of the input
that was used, and sends it on to the output. When a normally open contact is momentarily
closed, a high (1) is sent to the one-shot, which then turns on the output on that rung. If a
normally open contact is momentarily closed again, the one-shot receives a low (0), which then
turns the output off.
In conclusion, this lab was a great learning experience by introducing us to a new programming
instruction, which allows us to broaden our knowledge on PLC programming.

40. FINAL
39
Lab 11A Motor Time Start
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

41. FINAL
40
Introduction
The objective of lab 11A was to design a program on the PLC programming software that would
allow the user to start a single motor three seconds after the start push button was pressed. In
order to successfully program this type of operation we decided that utilizing two rungs would be
the easiest way. Rung 0 contains a master stop that was programmed as a normally open but
physically wired as a normally closed button, a start button with an energizing contact, and the
timer is located at the end of the rung. The preset value of the timer was set to “3000” indicating
3000 milliseconds, or 3 seconds. The normally open contact that is aliased to the timers done bit
(DN) is locate on rung 1 with the motor, therefore when the start button is pressed, the
energizing contact will energize, and energize the timer, this will cause the timer to start
counting. Once the timer’s accumulated value equals 3000, the done bit will be activated, closing
the contact on rung 1, energizing the motor. In order for this program to work successfully all the
contacts must be aliased properly. In this case the master stop was aliased to the input card (input
0) and the start button was also aliased to the input card (slot 1). It is crucial that the contact on
rung 1 (Timer_Done) is aliased to the done bit (DN) of the timer, or the rung will never become
energized and the motor will never turn on. The motor must also be aliased to the output card
(output 0) or the light will never turn on. With all of the above programmed properly this
program will allow the user to start a motor three seconds after the start button is pressed.

42. FINAL
41
Ladder Logic
Figure 11 Lab 11A Ladder Logic

43. FINAL
42
I/O Listing
Table 6 I/O Table for Lab 11A
Inputs Outputs Internal Inputs
Local:3:I.Data.0 (Master_Stop) Local:4:O.Data.0 (Motor) Timer.DN (Timer)
Local:3:I.Data.1 (Motor_Start)

44. FINAL
43
Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 12 Hardware Layout for Lab 11A

45. FINAL
44
Summary
This lab required us to create a program that will allow us to start a motor three seconds after the
start button has been pressed. This was accomplished by using a timer on instruction. This
allowed us to delay the starting of the motor by three seconds, once the start button was pressed.
Every time the accumulated value of the timer was equal to the preset value of the timer, he
motor would energize due to the timer contact on the same rung. Upon completion of this lab, we
were able to thoroughly understand the operation of how a timer works.
As we began to set-up the program we realized we had no way of keeping the timer energized
after the start button was pressed momentarily. After looking through our previous labs, we
noticed we needed a sealing contact that would be in parallel with the start button, which would
‘seal’ (close) once energized. As seen in Figure 11, we aliased this contact to the enable bit of the
timer. This was unnecessary since the enable bit of the timer is energized as long as the timer is
counting, so as long as the sealing contact remains energized, the timer enable bit would remain
energized. Once our small issue was resolved the program worked as specified, allowing the
motor to energize three seconds after the start button was pressed.
In conclusion, this lab was a great learning experience by introducing us to a new programming
instruction, which allows us to broaden our knowledge on PLC programming. This new
instruction (the timer) opened our minds as to what was to come next in our future labs.

46. FINAL
45
Lab 11B Push On/ Push Off
(Half-Second Flasher)
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

47. FINAL
46
Introduction
The objective of lab 11B was to design a program on the PLC programming software that would
allow the user to start a half-second flasher program as soon as power is applied to the program.
The program required the use of a single timer set to a half of a second. With that being said, as
soon as power is applied to the circuit, the timer would begin its count right away. The timer is
configured to reset itself every time the done bit energizes. Once the timer completes its count
the done bit will energize and a normally open contact on rung 1 will energize. When this contact
energizes and closes, the light will become true and turn on. The light will remain energized
through the parallel branch on rung 1. Once the timer has completed its count for a second time,
the normally closed contact in the parallel branch will open causing the light to de-energize. The
light will become energized once again when the timer completes its count for a third time. With
all of the above programmed properly, this program will allow the user to start a half-second
flasher program as soon as they apply power.

48. FINAL
47
Ladder Logic
Figure 13 Lab 11B Ladder Logic

49. FINAL
48
I/O Listing
Table 7 I/O Table for Lab 11B
Inputs Outputs Internal Inputs
N/A Local:4:O.Data.0 (Flash) Timer1.DN (Timer1)

50. FINAL
49
Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 14 Hardware Layout for Lab 11B

51. FINAL
50
Summary
This lab required us to create a program that will allow us to turn an output on & off every ½ a
second automatically. This was accomplished by utilizing the timer instruction. With this timer
set to 500 milliseconds (0.5 seconds), we are able to control the time at which the output turns on
& off. This program begins to work as soon as it is downloaded to the PLC. Using a normally
closed contact aliased to the timer done bit, we are allowing the timer to reset itself ever time the
accumulated value equals the preset value. Upon completion of this lab, we were able to
understand how to use a timer done bit to reset a timer.
As the lab progressed, we encountered the problem of how we were going to be able to reset the
timer automatically without any outside interference. Using our knowledge from the previous
lab, we thought of a way to utilize the done bit of the timer, on the same rung as the timer. We
understood that every time the timer accumulated value equals the preset value, that the timer
done bit would be energized. This would cause normally closed contacts to open, and normally
open contacts to close, if aliased to the done bit. Therefore, we realized that maybe if we place a
normally closed contact on the same rung as the timer; that when energized will reset the timer
back to zero and start its timing sequence again.
In conclusion, this lab was a great learning experience by allowing us to learn how to create a
program that will operate on its own without any outside interference, once started.

52. FINAL
51
Lab 12A Six Motor Time Start
Using Timer Instruction
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

53. FINAL
52
Introduction
The objective of this lab was design a program on the PLC software that would start six motors
one after the other. The first motor would turn on as soon as the start button was pressed and the
remaining motors would start 3 seconds after the previous motor has started. This lab only
required one start push button and one master stop button to de-energize the whole process when
pressed. Rung 0 was programmed to energize a series of contacts to energize and turn on the
motor on rung 1. In this case the master stop button was only needed on the first rung because
de-energizing the first rung would ultimately de-energize motor one and everything subsequent
to that motor. This program was programmed so everything would energize in sequence, three
seconds after one another. For example once the start push button has been pressed, the first
motor will energize and turn on. The sealing contact on rung 2 (Timer1) will also energize when
the sealing contact on rung 1 energizes, allowing the timer on rung 2 to start counting. Once the
timer reaches the accumulated value of 3000, a contact on rung 3 will energize that is aliased to
the done bit (DN) of the timer, this will enable another timer to start its three second count. The
done bit of Timer1 is also aliased to a contact on rung 7, this rung contains the second motor,
therefore when the contact energizes the motor will energize and turn on. This operation was
duplicated several more times to successfully turn on all the motors according to the
requirements of the lab. With the above programmed properly, this program will allow the user
to start a total of six motors in a timed sequence of three seconds after the first motor is
energized.

54. FINAL
53
Ladder Logic
Figure 15 Lab 12A Ladder Logic (1)

55. FINAL
54
Figure 16 Lab 12A Ladder Logic (2)

56. FINAL
55
I/O Listing
Table 8 I/O Table for Lab 12A
Inputs Outputs Internal Inputs
Local:3:I.Data.0 (Master_Stop) Local:4:O.Data.1 (Motor1) Seal
Local:3:I.Data.1 (Motor_Start) Local:4:O.Data.2 (Motor2) Timer1.DN (Timer1)
Local:4:O.Data.3 (Motor3) Timer2.DN (Timer2)
Local:4:O.Data.4 (Motor4) Timer3.DN (Timer3)
Local:4:O.Data.5 (Motor5) Timer4.DN (Timer4)
Local:4:O.Data.6 (Motor6) Timer5.DN (Timer5)

57. FINAL
56
Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 17 Hardware Layout for Lab 12A

58. FINAL
57
Summary
This lab required us to create a program that will allow us to turn on six motors at different
times. This was accomplished by utilizing five timers. By using these timers, we were able to
start the motors in a timed sequence (three seconds after each other). A preliminary requirement
of starting motor one immediately, once the start button has been pressed. Each motor after
motor one is separated by a three second timer, which allows the subsequent motors to start in
order. Upon completion of this lab, we were able to utilize timers to start numerous motors in a
desired order.
As we began to set up the program we realized we needed a way to separate motors once the
start push button was pressed. This created a problem because each motor had to start three
seconds after the motor before it had started. Therefore, by using some previous knowledge we
had gained from early labs, we knew we had to use the timer done bits to accomplish this task.
Once we had created a program that would start motor one once the start button was pressed, we
used a timer on a separate rung and another output after the timer on another rung. This allowed
us to test our theory. After proving that we needed to use a normally open contact aliased to the
timer done bit in series with the motor, we used the same idea to start the other motors as seen in
Figures 15 & 16.
In conclusion, this lab was a great learning experience by proving that timers can be used to start
different motors or equipment in an organized sequence.

59. FINAL
58
Lab 12B Six Motor Time Start
and Timed Shutdown
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

60. FINAL
59
Introduction
The objective of lab 12B was to design a program on the PLC programming software that would
allow the user to start six motors in a timed sequence of three seconds after the push button is
pressed and motor one is energized. In addition, the program will have a timed shutdown
sequence of four seconds starting with motor six; Therefore the shutdown sequence will be,
motor 6, motor 5, motor 4, motor 3, motor 2, and motor 1. Given the requirements for this lab, a
total of one master stop button and one start button will be used. Once the start button is pressed,
the first motor will energize and the first timer will begin its three second count. Once the
accumulated value of the timer reaches 3000, the second motor will become energized and the
second timer will also begin another 3 second count. This same sequence of operations will
continue for all the remaining motors, so that all six motors eventually turn on. This program
should be identical to the program in lab 12A. However in addition, the Timer5 done bit is also
aliased to a contact on rung 7, once this contact is energized, Timer1_off will begin its four
second count. Once the accumulated value has reached 4000, a normally closed (Examine OFF)
contact will open on rung 17. Since motor six is on rung 17, the motor will de-energize and turn
off. The Timer1_off done bit is also aliased to a normally open contact on rung 8 which allow
Timer2_off to begin its four second count. Once the timers’ accumulated value reaches 4000,
motor 5 will de-energize and turn off, and Timer3_off will begin counting. This sequence will
continue until all motors are turned off. With the above programmed properly, this program will

61. FINAL
60
allow the user to start a total of six motors in a timed sequence of three seconds, which will
automatically turn off in a timed sequence of four seconds starting with the sixth motor.

62. FINAL
61
Ladder Logic
Figure 18 Lab 12B Ladder Logic (1)

63. FINAL
62
Figure 19 Lab 12B Ladder Logic (2)

64. FINAL
63
Figure 20 Lab 12B Ladder Logic (3)

65. FINAL
64
I/O Listing
Table 9 I/O Table for Lab 12B
Inputs Outputs Internal Inputs
Local:3:I.Data.0 (Master_Stop) Local:4:O.Data.1 (Motor1) Seal
Local:3:I.Data.1 (Motor_Start) Local:4:O.Data.2 (Motor2) Timer1.DN (Timer1)
Local:4:O.Data.3 (Motor3) Timer2.DN (Timer2)
Local:4:O.Data.4 (Motor4) Timer3.DN (Timer3)
Local:4:O.Data.5 (Motor5) Timer4.DN (Timer4)
Local:4:O.Data.6 (Motor6) Timer5.DN (Timer5)
Timer1_off.DN
(Timer1_off)
Timer2_off.DN
(Timer2_off)
Timer3_off.DN
(Timer3_off)
Timer4_off.DN
(Timer4_off)
Timer5_off.DN
(Timer5_off)
Timer6_off.DN
(Timer6_off)

66. FINAL
65
Hardware AutoCAD Listing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 21 Hardware Layout for Lab 12B

67. FINAL
66
Summary
This lab required us to create a program that will allow us to turn on & off six motors at different
times. This was again accomplished using timers, as seen in lab 12A, but this time we are using
11 timers. The first five timers are used exactly the same way as in the previous lab, except the
done bit of timer five is used to start the timing of the sixth timer (Timer1_Off). The sixth timer
is used to turn off motor six by opening a normally closed contact that is aliased to its done bit.
The same process is used for timers seven (Timer2_Off), eight (Timer3_Off), nine
(Timer4_Off), ten (Timer5_Off), and eleven (Timer6_Off); which turn off motors five, four,
three, two, and one respectively. Upon completion of this lab, we were able to utilize timers to
stop numerous motors in a desired order.
As the lab progressed, we encounter an issue while trying to turn off the motors, once they were
all on. The problem started when we were trying to decide how we were going to keep the
motors energized until we wanted to turn them off. After playing around with some different
ideas, we came to the conclusion that we must use normally closed contacts on all of the motor
rungs. These contacts were to be aliased to the desired four second timer to decide their shut
down sequence. This allowed each motor to turn on when the rung become energized. Once the
desired Timer(#)_Off done bit was energized, we were able to see that the normally closed
contact would then open, ultimately de-energizing the rung and turning off the motor.
In conclusion, this lab was a great learning experience by proving that timers can be used to turn
off different motors or equipment in an organized sequence in addition to turning them on.

68. FINAL
67
Lab 12C Six Motor Time Start
and Timed Shutdown
with Automatic
Recycled Start-up
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

69. FINAL
68
Introduction
The objective of lab 12C was to design a program on the PLC programming software that would
allow the user to start six motors in a timed sequence of three seconds, and then turn the motors
off in reverse order in a timed sequence of four seconds starting with motor six. In addition, the
program will automatically start the turn on sequence once all motors have been de-energized.
Therefore the program will continuously turn on all the motors and turn them off until the master
stop button is pressed. This program should only contain a total of one master stop button and
one start button. The turn on sequence will be identical to that of lab 12A and lab 12B, where as
soon as the start button is pressed motor one will energize and a three second timer will begin to
count. When the timer’s accumulated value reaches the preset value of 3000, the done bit will
become energized along with a contact aliased to the timers done bit, therefore this contact will
close and the next motor will become energized and another timer will begin counting to start the
next motor in sequence. The turn off sequence is also very similar to that of lab 12B. When the
last on timer (Timer5) counts to three seconds, the sixth motor will become energized and the
first off timer will also begin counting. Once the first off timer (Timer1_off) counts to four
seconds, a total of two contacts will energize, both of which are aliased to the done bit of the
timer. One normally closed contact on the same rung as Motor 6 will open causing Motor 6 to
de-energize, and another normally open contact will close to allow the second off timer to begin
its four second count. This operation will proceed until all motors are off. Once the final off timer
has completed its count of four seconds, the done bit of that timer will energize causing Motor 1
to de-energize. A normally open contact will also energize on rung 13 causing the Reset timer to
begin its count of one second. Once the Reset timer has completed its count a normally closed
contact on rung 2 will open momentarily causing the accumulated values of all the timers to
return to 0. Therefore the contact will re-close and Timer1 will restart counting since the seal
contact is still energized.

70. FINAL
69
Ladder Logic
Figure 22 Lab 12C Ladder Logic (1)

71. FINAL
70
Figure 23 Lab 12C Ladder Logic (2)

72. FINAL
71
Figure 24 Lab 12C Ladder Logic (3)

73. FINAL
72
I/O Listing
Table 10 I/O Table for Lab 12C
Inputs Outputs Internal Inputs
Local:3:I.Data.0 (Master_Stop) Local:4:O.Data.1 (Motor1) Seal
Local:3:I.Data.1 (Motor_Start) Local:4:O.Data.2 (Motor2) Timer1.DN (Timer1)
Local:4:O.Data.3 (Motor3) Timer2.DN (Timer2)
Local:4:O.Data.4 (Motor4) Timer3.DN (Timer3)
Local:4:O.Data.5 (Motor5) Timer4.DN (Timer4)
Local:4:O.Data.6 (Motor6) Timer5.DN (Timer5)
Timer1_off.DN
(Timer1_off)
Timer2_off.DN
(Timer2_off)
Timer3_off.DN
(Timer3_off)
Timer4_off.DN
(Timer4_off)
Timer5_off.DN
(Timer5_off)
Timer6_off.DN
(Timer6_off)
Reset.DN (Reset)

74. FINAL
73
Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 25 Hardware Layout for Lab 12C

75. FINAL
74
Summary
This lab required us to create a program that will allow us to automatically restart the turning on
& off of six motors at different times. This was accomplished by adding one more timer to the
previous labs requirements. This timer is used to reset the whole program, by opening the
normally closed contact on the same rung as Timer1. This causes all of the timers’ accumulated
values to reset to zero. Upon completion of this lab, we were able to utilize a timer to reset other
times to allow for our program to restart.
As we began to set-up the program we realized we had to come up with a way to reset all of the
timers’ accumulated values to zero. We solved this issue by adding another timer, which we
would call Reset, to remind us the use of this timer. By adding a normally closed contact (aliased
to the Reset done bit) in series with Timer1, we were able to de-energize Timer1. This caused all
subsequent rungs with timers and outputs to become de-energized, due to the various contacts
that opened (See Figures 22, 23, & 24). By de-energizing Timer1 and the other timers, we were
able to reset the accumulated value back to zero. This allowed the sequence to start over, once
the reset timer had been de-energized.
In conclusion, this lab was a great learning experience by proving that we can reset a program by
just using a timer.

76. FINAL
75
Lab 12D Six Motor Time Start
and Timed Shutdown
with Automatic
Recycled Start-up Four
Times Only
ELR223
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

77. FINAL
76
Introduction
The objective of lab 12D was to design a program on the PLC programming software that would
allow the user to start six motors in a timed sequence of three seconds, then turn the motors off in
reverse order in a timed sequence of four seconds starting with motor six and automatically
restarting this process. In addition, the program will include a counter, therefore limiting the
amount of repeats to a desired value. This lab requires that counter to count to four repeats and
then de-energize the circuit. The turn on sequence will be identical to that of lab 12A, 12B and
lab 12C, where as soon as the start button is pressed motor one will energize and a 3 second
timer will begin to count. When the timer’s accumulated value reaches the preset value of 3000,
the done bit will become energized along with a contact aliased to the timers done bit, therefore
this contact will close and the next motor will become energized and another timer will begin
counting to start the next motor in sequence. The turn off sequence is also very similar to that of
lab 12B and 12C. When the last on timer (Timer5) counts to three seconds, the sixth motor will
become energized and the first off timer will also begin counting. Once the first off timer
(Timer1_off) counts to four seconds, a total of two contacts will energize, both of which are
aliased to the done bit of the timer. One normally closed contact on the same rung as Motor 6
will open causing Motor 6 to de-energize, and another normally open contact will close to allow
the second off timer to begin its four second count. This operation will proceed until all motors
are off. Once the final off timer has completed its count of four seconds, the done bit of that will
energize, causing Motor 1 to de-energize. A normally open contact will also energize on rung 13
causing the Reset timer to begin its count of one second. Once the Reset timer has completed its
count, a normally closed contact on rung 2 will open momentarily causing the accumulated
values of all the timers to return to 0. The Reset timer will also close a normally open contact on

78. FINAL
77
rung 15, which will energize the counter momentarily until all timers are reset. This will cause
the counters accumulated value to increment by 1. Once the counters accumulated value reaches
the preset value the done bit will become energized. This will cause a normally closed contact on
rung 0 to energize and open, thus de-energizing the entire circuit. When the sealing contacts de-
energize, the counter reset will become energize therefore resetting the counter accumulated
value back to 0. The program will now be ready for the user to hit the start button again to begin
the process. With the above programmed properly, this program will allow the user to start a
total of six motors in a timed sequence of three seconds, which will automatically turn off in a
timed sequence of four seconds starting with the sixth motor and repeat a total of four times.

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Ladder Logic
Figure 26 Lab 12D Ladder Logic (1)

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Figure 27 Lab 12D Ladder Logic (2)

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Figure 28 Lab 12D Ladder Logic (3)

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I/O Listing
Table 11 I/O Table for Lab 12D
Inputs Outputs Internal Inputs
Local:3:I.Data.0 (Master_Stop) Local:4:O.Data.1 (Motor1) Seal
Local:3:I.Data.1 (Motor_Start) Local:4:O.Data.2 (Motor2) Timer1_On.DN
(Timer1_On)
Local:4:O.Data.3 (Motor3) Timer2_On.DN
(Timer2_On)
Local:4:O.Data.4 (Motor4) Timer3_On.DN
(Timer3_On)
Local:4:O.Data.5 (Motor5) Timer4_On.DN
(Timer4_On)
Local:4:O.Data.6 (Motor6) Timer5_On.DN
(Timer5_On)
Timer1_off.DN
(Timer1_off)
Timer2_off.DN
(Timer2_off)
Timer3_off.DN
(Timer3_off)
Timer4_off.DN
(Timer4_off)
Timer5_off.DN
(Timer5_off)
Timer6_off.DN
(Timer6_off)
Reset.DN (Reset)
Counter1.DN (Counter1)

83. FINAL
82
Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 29 Hardware Layout for Lab 12D

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Summary
This lab required us to create a program that will allow us to automatically restart the turning on
& off of six motors at different times, a total of four times. This was accomplished by utilizing
the up counter instruction. The up counter, allows us to stop the program from repeating more
than four times. By using a normally closed contact (Aliased to the counter done it) on rung 0,
we are able to de-energize the sealing contact, which de-energizes the whole program. Upon
completion of this lab, we were able to utilize a counter to record how many times the process
has repeated its cycle.
As the lab progressed, we encountered an issue when we wanted to utilize the up counter to stop
the program after it had repeated four times. While using the counter, we quickly learned that the
program would keep repeating even though the accumulated value had reached the preset value.
Therefore, we inquired the assistance of the RSLogix help feature to assist us in the operation of
the counter. We then realized that the counter had a done bit just like the timer. This allowed us
to utilize a normally closed contact (Aliased to the counter done bit) in series with the sealing
contact; which would open once the accumulated value of the counter was equal to the preset
value of the counter. This caused the seal to de-energize, which ultimately de-energized motor 1,
which caused all subsequent rungs to de-energize.
In conclusion, this lab was a great learning experience by introducing us to the up counter
instruction and allowing us to experiment with its capabilities.

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84
Lab 13A Six Motor Time Start
and Timed Shutdown
with Automatic
Recycled Start-up Four
Times Only Using Limit
Test
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

86. FINAL
85
Introduction
The objective of lab 13A was to design a program on the PLC programming software that would
allow the user to start six motors in a timed sequence of three seconds, then turn the motors off in
reverse order in a timed sequence of four seconds starting with motor six. The program will also
automatically start the turn on sequence once all motors have been de-energized; the process will
be limited to four repeats. The program must be programmed only with the Limit test operation.
Therefore each motor will be turned on using a Limit test. In the program a total of two timers
were used, one timer (Timer) is used to establish the test value for each Limit instruction. The
timer has a preset value of 40000 (40 seconds) which is the total time for the process to complete
one cycle of operation. Each limit instructions “Test” value is aliased to the Timer.ACC,
therefore when the timer’s accumulative value reaches 1 the first limit instruction will become
true and energize the first motor. Each Limit was programmed identically with only the lower
and upper limits changing according to when the specific motor needed to be turned on. The
motors will stay energized as long as the timer’s accumulated value is within the lower limits and
high limits. This program was programmed to meet the requirements of the lab, therefore each
motor will turn on three seconds after the previous motor has energized, and each motor will turn
off in a timed sequence of four seconds in reverse order starting with Motor 6. Since the first
Limit has a high limit of 38000, all motors will be turned off when the accumulated value of the
timer reaches 40000. When “Timer” finishes its count the done bit will energize, also energizing
a normally closed contact on rung 11, thus causing the counter to increment by one in its
accumulative value. Once the counter accumulated value reaches the preset value, the counters
done bit will become energized, which will cause a normally closed contact on rung 0 to open
and de-energize the process. To restart the process the user must push the start button again. To

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allow for the user to simply push the start button to start the process again, an extra reset
instruction was programmed to reset the counter. When the counters accumulated value is equal
to the preset value the counter will de-energize rung 0 as explained before, the sealing contacts
will also de-energize. The normally closed contact on the same rung is open during the normal
operation period of the process, but when the counter causes rung 0 to de-energize, the sealing
contact on rung 4 closes therefore resetting the accumulated value of the counter back to 0. Since
the accumulated value of the timer is no longer equal to the preset value, the normally closed
contact on rung 0 closes therefore enabling the rung to become energized once again as soon as
the start button is pressed. With the above programmed properly, this program will allow the
user to start a total of six motors in a timed sequence of three seconds, which will automatically
turn off in a timed sequence of four seconds starting with the sixth motor and repeat the process
four times.

88. FINAL
87
Ladder Logic
Figure 30 Lab 13A Ladder Logic (1)

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88
Figure 31 Lab 13A Ladder Logic (2)

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I/O Listing
Table 12 I/O Table for Lab 13A
Inputs Outputs Internal Inputs
Local:3:I.Data.0 (Master_Stop) Local:4:O.Data.1 (Motor1) Seal
Local:3:I.Data.1 (Motor_Start) Local:4:O.Data.2 (Motor2) Timer.DN (Timer)
Local:4:O.Data.3 (Motor3) Timer_Reset.DN
(Timer_Reset)
Local:4:O.Data.4 (Motor4) Limit Tests x 6
Local:4:O.Data.5 (Motor5) Counter.DN (Counter)
Local:4:O.Data.6 (Motor6)

91. FINAL
90
Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 32 Hardware Layout for Lab 13A

92. FINAL
91
Summary
This lab required us to create a program that will allow us to automatically restart the turning on
& off of six motors at different times, a total of four times. This was accomplished by utilizing
the limit instruction. The limit instruction allows us to control when the rung will be true, by
watching the accumulated value of a timer. As long as the accumulated value of the timer is
between the range that is specified by the limit instruction, the rung will be true. Once the
accumulated value is outside of the specified range, the rung will be false. Upon completion of
this lab, we were able to utilize the limit instruction to control when we wanted each motor to
turn on and off.
As we began to set-up the program we realized that we had to tell the limit instructions which
values to test so they would operate when we wanted them to. This again led us to the RSLogix
help feature, where we quickly learned that the limit instruction required an alias or value of
some sort in order to operate. Therefore, after some more critical thinking, we realized we had to
use a timer that would have a preset value greater than the duration of the sequence of the motors
turning on & off. Once we had the timer set up, we aliased the limit instructions test value to the
Timer.ACC. This allowed the limit instruction to ‘test’ all the values that would be provided by
the accumulated value of the timer.
In conclusion, this lab was a great learning experience by introducing us to the limit instruction
and allowing us to learn how we can utilize this instruction to control the operation of outputs.

93. FINAL
92
Lab 13B Six Motor Time Start
and Timed Shutdown
with Automatic
Recycled Start-up Four
Times Only; Using
Sequencer Output
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

94. FINAL
93
Introduction
The objective of lab 13A was to design a program on the PLC programming software that would
allow the user to start six motors in a timed sequence of three seconds, and then turn the motors
off in reverse order in a timed sequence of four seconds starting with motor six. The program
will also automatically start the turn on sequence once all motors have been de-energized; the
process will be limited to four repeats. The program must be programmed only with the
sequencer output. A total of one master stop button and one start button is needed to start the
process. Once the start push button is pressed the sealing contact energizes, therefore the
normally closed sealing contact on rung 1 will open enabling the counter to count. A sealing
contact on rung 2 is also energized enabling the timer to start counting. Once the accumulated
value of the timer reaches the preset value, a normally open contact aliased to the timers done bit
is energized on rung 3 with the sequencer. The timer also resets itself with the normally closed
contact aliased to the timers done bit; every time the timer’s accumulated value equals the preset
value the contact opens momentarily then re-closes since the accumulated value will not be equal
to the preset value. Therefore every time the timer counts to one second (or the desired
programmed time) the sequencer will move to its next programmed position. The programmed
positions are shown below in Figure 33. The mask of the sequencer is also programmed so only
six outputs can be changed. Once the sequencer has completed the “length” of 40 moves the
done bit will become energized, this done bit is aliased with a normally open contact on rung six
with the counter. Therefore every time the sequencer finishes 40 moves (including the motors
turning on and turning off), the counter will increment the accumulated value by one. When the
counters accumulated value equals the preset value, the normally closed contact on rung 0 will
momentarily open and de-energize the circuit. This will cause the sealing contact on rung 7 to

95. FINAL
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open, shifting a 0 into the move instruction. The move instruction will then move the 0 (low) into
the sequencer causing all the outputs to de-energize and the process to stop. If the MOV
instruction is not used the sequencer will stop in the position it was stopped in meaning outputs
may be left on. Referring back to when the counter de-energizes the circuit; this happens only for
a brief second because the normally closed contact on rung 1 will re-close, energizing the
counter reset instruction. Therefore the process may be started again by simply pressing the start
push button. With the above programmed properly, this program will allow the user to start a
total of six motors in a timed sequence of three seconds, which will automatically turn off in a
timed sequence of four seconds starting with the sixth motor and repeat the process four times.

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SequencerSetup
Figure 33 Array for Sequencer Control

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96
Ladder Logic
Figure 34 Lab 13B Ladder Logic

98. FINAL
97
I/O Listing
Table 13 I/O Table for Lab 13B
Inputs Outputs Internal Inputs
Local:3:I.Data.0 (Master_Stop) Local:4:O.Data.0 (Motor1) Seal
Local:3:I.Data.1 (Motor_Start) Local:4:O.Data.1 (Motor2) Timer.DN (Timer)
Local:4:O.Data.2 (Motor3) Timer_Reset.DN
(Timer_Reset)
Local:4:O.Data.3 (Motor4) Sequencer Output
(Control)
Local:4:O.Data.4 (Motor5) Counter.DN (Counter)
Local:4:O.Data.5 (Motor6) MOV (Move)

99. FINAL
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Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 35 Hardware Layout for Lab 13B

100. FINAL
99
Summary
This lab required us to create a program that will allow us to automatically restart the turning on
& off of six motors at different times, a total of four times. This was accomplished by utilizing
the sequencer output instruction. The sequencer output instruction allows us to control when
each output is to be turned on or off by changing position according to an array. This array
allows for various combinations of outputs to be controlled and read by the sequencer. Also, by
creating a mask we are able to tell the sequencer which outputs we want it to control and those
we do not want it to control. Upon completion of this lab, we were able to utilize the sequence
output instruction to control when we wanted each motor to turn on and off.
As the lab progressed, we encountered a problem when we wanted the outputs to de-energize and
the sequencer to reset its position to zero. We noticed this was an issue when we tried stopping
the program while it was in the middle of its operation. By inquiring the assistance of our
instructor and the help feature on RSLogix, we were able to see that we had to utilize a MOV
(Move) instruction to ‘move’ a zero into the position of the sequencer, once the stop button was
pressed. Once we had set-up the MOV instruction, we still had an issue. The MOV instruction
was turning our outputs off, but our sequencer was still at the position it was stopped at (it did
not reset to zero). Therefore we had to use a reset instruction aliased to the control portion of the
sequencer. This allowed us to reset the sequencer position to zero when the stop button was
pressed, ultimately allowing us to start the sequence from the beginning.
In conclusion, this lab was a great learning experience by introducing us to the sequencer output
instruction and allowing us to use it to control different outputs by controlling there state
(On/Off).

101. FINAL
100
Lab 14A Traffic Lights with
Delayed Red Lights
(Timers Inst.)
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

102. FINAL
101
Introduction
The objective of lab 14A was to design a program on the PLC programming software that would
allow the user to start a traffic light with a total of 12 lights. The program was designed for a
basic traffic light with, two reds, two greens, and two yellows (North-South, East-West). The
lights will be energized for a fixed length of time such as; the red lights will be on for five
seconds, the green lights will be on for four seconds, and the yellow lights will be on for three
seconds. The program will begin as soon as the start push button is pressed. When the start
button is pressed, all seal contacts will become energized and all four red lights will turn on. As
seen in Figure 36 below, all red lights are located on rung 7 in a parallel branch. There are a total
of six timers used in the program and each are very necessary with respect to the operation of the
program. The first timer tagged “Till_Green1” will energize once the sealing contact is
energized. Once this timer has completed its five second count (meaning all the red lights have
been on for five seconds) a contact on rung 2 will energize to start the “Till_Yellow1” timer and
a normally closed contact will energize and open on rung 7, therefore the North and South red
lights will turn off. A normally open contact on rung 8 will also energize turning on the North
and South green lights. Once the timer “Till_Yellow1” has completed its four second count, the
normally closed contact on rung 8 will energize and open, therefore turning off the green lights
and a normally closed contact on rung 9 will energize, turning on the North and South yellow
lights. In addition, the “Till_Yellow1” timer’s done bit will energize a normally open contact on
rung 3, allowing the timer “Till_Red1” to begin its three second count. After the timer
“Till_Red1” has completed its count, the North and South lights will return to their red state.
This process is then repeated with different timers that correspond to the East and West sides.
Once the East and West lights have turned have turned yellow the “Reset” timer will begin its

103. FINAL
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three second count. This will allow the East and West lights to remain on for three seconds. Once
the Reset timer has completed its count, the done bit will energize and couple of contacts will
energize. A normally closed contact will open on rung 11 causing the East and West yellow
lights to de-energize and turn off. A normally closed contact will energize and open on rung 1
causing the accumulated values of all the timers to return to 0, therefore the “Reset” timer will
reset and the normally closed contact (Reset.DN) will de-energize and close, thus allowing the
timer “Till_Green1” to begin counting again. The process will repeat until the master stop push
button is pressed and de-energizes all the sealing contacts. With all of the above programmed
properly, this program will allow the user to start a timed sequence of lights that can be
configured as a traffic light.

104. FINAL
103
Ladder Logic
Figure 36 Lab 14A Ladder Logic (1)

105. FINAL
104
Figure 37 Lab 14A Ladder Logic (2)

106. FINAL
105
I/O Listing
Table 14 I/O Table for Lab 14A
Inputs Outputs Internal Inputs
Local:3:I.Data.0 (Master_Stop) Local:4:O.Data.1 (North_Red) Seal
Local:3:I.Data.1 (Start) Local:4:O.Data.2 (East_Red) Reset.DN (Reset)
Local:4:O.Data.3 (South_Red) Till_Green1.DN
(Till_Green1)
Local:4:O.Data.4 (West_Red) Till_Yellow1.DN
(Till_Yellow1)
Local:4:O.Data.5 (North_Green) Till_Red1.DN
(Till_Red1)
Local:4:O.Data.6 (East_Green) Till_Green2.DN
(Till_Green2)
Local:4:O.Data.7 (South_Green) Till_Yellow2.DN
(Till_Yellow2)
Local:4:O.Data.8 (West_Green)
Local:4:O.Data.9 (North_Yellow)
Local:4:O.Data.10 (East_Yellow)
Local:4:O.Data.11 (South_Yellow)
Local:4:O.Data.12 (West_Yellow)

107. FINAL
106
Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 38 Hardware Layout for Lab 14A

108. FINAL
107
Summary
This lab required us to create a program that will allow us to control traffic lights with the use of
timers. This was accomplished by strategically placing outputs and timers. By keeping all of the
timers in order, we were able to configure different rungs to energize at desired times. Also by
keeping the outputs (Red, Green, & Yellow lights) organized, we were able to quickly set up a
program to control the lights. Upon completion of this lab, we were able to utilize timers to
control the length of time each pair of lights were on.
As we began to set-up the program we realized we needed a way to keep at least two red lights
on while the other directions where changing (Green and Yellow). After a while of playing with
some different ideas, we came up with the idea to throw both pairs of red lights in parallel. This
allowed us to separately control their states with different timers (See Rung 7 in Figure 36). This
also gave us the ability to turn on the one set of red lights again by placing another contact in
parallel to an already existing one. By doing this we can switch the direction of which lights are
red at a given time, allowing us to ensure at least two directions have red lights active at all
times.
In conclusion, this lab was a great learning experience by allowing us to control traffic lights
with timers, making us think of ways to utilize these previously learned instructions to meet the
requirements of this lab.

109. FINAL
108
Lab 14B Traffic Lights with
Delayed Red Lights
(Limit Inst.)
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND

110. FINAL
109
Introduction
The objective of lab 14B was to design a program on the PLC programming software that would
allow the user to start a traffic light with a total of 12 lights. In addition the program must be
programmed with the Limit Test Instruction along with any other necessary instructions. The
program was designed for a basic traffic light with, two reds, two greens, and two yellows
(North-South, East-West). The lights will be energized for a fixed length of time such as; the red
lights will be on for five seconds, the green lights will be on for four seconds, and the yellow
lights will be on for three seconds. The program will begin its sequence as soon as the start push
button is pressed. There are a total of seven limit test instructions that were used in the designing
of this program, each of which will be testing the accumulated value of one timer and the lights
will energize with respect to the low and high limits of the limit test instruction on the same
branch as the specific lights. With that being said, once the start button is pressed all sealing
contacts are energized and the main timer begins to start its count. The timer is located on rung 1
and has a preset value of 24000, this is the total time it takes for the traffic light to complete one
full sequence with respect to the time specifications of each light. All of the red lights will be
energized and turn on when the accumulated value of the timer equals 1. Once the timer reaches
an accumulated value of 5000, the North and South red lights will de-energize, and the North and
South green lights will turn on until the accumulated value of the timer reaches 9000. Once the
accumulated value of the timer reaches 9000, the green lights will de-energize and the North and
South yellow lights will energize until the accumulated value of the timer reaches 12000. When
the timer reaches 12000, the North and South yellow lights de-energize and the North and South
lights re-energize due to the two parallel limit test instructions on rung 2. The North and South
red lights will remain on until the East and West side lights complete their full sequence. The

111. FINAL
110
cycle will end when the accumulated value of the timer reaches 24000, at this point in time the
timers done bit will energize and the normally closed contact on rung 1 will energize therefore
resetting the accumulated value of the timer back to 0. The “Reset.DN” contact then re-closes
and the timer begins its count again and the light sequence repeats. With all of the above
programmed properly, this program will allow the user to start a timed sequence of lights that
can be configured as a traffic light.

112. FINAL
111
Ladder Logic
Figure 39 Lab 14B Ladder Logic (1)

113. FINAL
112
Figure 40 Lab 14B Ladder Logic (2)

114. FINAL
113
I/O Listing
Table 15 I/O Table for Lab 14B
Inputs Outputs Internal Inputs
Local:3:I.Data.0 (Master_Stop) Local:4:O.Data.1 (North_Red) Seal
Local:3:I.Data.1 (Start) Local:4:O.Data.2 (South_Red) Timer.DN (Timer)
Local:4:O.Data.3 (North_Green) Limit Instruction x 7
Local:4:O.Data.4 (South_Green)
Local:4:O.Data.5 (North_Yellow)
Local:4:O.Data.6 (South_Yellow)
Local:4:O.Data.7 (East_Red)
Local:4:O.Data.8 (West_Red)
Local:4:O.Data.9 (East_Green)
Local:4:O.Data.10 (West_Green)
Local:4:O.Data.11 (East_Yellow)
Local:4:O.Data.12 (West_Yellow)

115. FINAL
114
Hardware AutoCAD Drawing
PB4
PB8
PB11 PB12
SS1
P3
P8
P13
P5
PB2
P11
P1 P4
P7
P12
P2
P6
P9
P14
PB9
P16P15
P10
PB3
PB7
PB1
SS2
PB5 PB6
PB10
OUTPUTS INPUTS
Allen-Bradley
A·B
Allen-Bradley
A·B
Allen-BradleyA·B
+ 151413121110 9 8 7 6 5 4 3 2 1 0
OUTPUTS INPUTS
YELLOW - N.C.
RED - N.O.
24V O/P
24V Supply
+-
- 151413121110 9 8 7 6 5 4 3 2 1 0
Figure 41 Hardware Layout for Lab 14B

116. FINAL
115
Summary
This lab required us to design a program that would run a basic traffic light with a total of twelve
lights using the Limit Test instruction. After having used the Limit test instruction in a previous
lab the programming of this lab went fairly smoothly. Just as in lab 13A, one timer was used for
the Limit instructions. A different limit instruction was programmed with different low limits
and high limits in order for the lights to turn on in the proper sequence.
This is where we encountered our first and only problem. In the beginning we could not figure
out how to turn the North and South Red lights back on, and stay on for the duration of the East
and West cycle. Since the North and South Red lights had to be turned on at the half way point
of the program (which was twelve seconds in), we came to the conclusion that a limit test
instruction had to be placed in parallel of the one currently on rung 2. Thus by making the low
limit twelve seconds and the high limit twenty-four seconds we were able to turn the North and
South Red lights back on for the duration of the East and West light cycle.
In conclusion, this lab had us apply our knowledge gained from the previous lab using the Limit
Test instruction to a challenging yet practical lab of controlling a traffic light.

117. FINAL
116
Lab 14C Traffic Lights with
Delayed Red Light
(Sequencer O/P Inst.)
Sean Forbes & Cody Bougie
INSTRUCTOR: RON CHARTRAND