treinamento automação siemens,

1. SIEMENS
Content
Pulse Width Modulation (PMW)
PID Controfler
Ctosed Loop Controlled System
Controller Bufid
Add Cyclic Interrupt OB
Add PID Controller
Compact and Expanded View
Formal Parameter - Input
Formal parameter- Output
Formal Parameter - Slate
Define Variable
Configuration
Input Scaling
Input Monitoring
Set PWM Hysteresis
Output Limits
Manual PID parameter
Variable for Warning Limits
Commissioning - Workflow
Commissioning
Commissioning - Kind of Commissioning
Commissioning - Online
PID Exercise ....................................................................................................................................
Exercise - PID Controller
Exercise 8-1: Add Ne~v Project with Hardware
Exercise 8-1: Setup PLC tags
Exercise 8-1: Add program and OB
Exercise 8-1: Add P]D Controller
Exercise 8-1: Parametefize PID Controller
Exercise 8-1: Scale the Inputs
Exercise 8-1: Download whole project
Exercise 8-1: Commissioning PID Controfler
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2. PID Controller
Exercise PID
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3. Pulse Width Modulation (PWM)
SIEMENS
CTRL_PWM Instruction
The CTRL_PWM Pulse Width Modulation (PWM) instruction provides a fixed cycle time output with a
variable duty cycle. The PWM output runs continuously after being started at the specified frequency
(cycle time). The pulse width is varied as required to effect the desired control. Duty cycle can be
expressed as a percentage of the cycle time (0 - 100%), as thousandths (0 - 1000), as ten thousandths
(0 - 10000), or as $7 analog format. The pulse width can vary from 0 (no pulse, always off) to full scale
(no pulse, always on).
Since the PWM output can be varied from 0 to full scale, it provides a digital output that in many ways is
the same as an analog output. For example, the PWM output can be used to control the speed of a motor
from stop to full speed, or it can be used to control position of a valve from closed to fully opened.
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4. Pulse Width Modulation (PWM)
SIEMENS
Two pulse generators are available for controlling high-speed pulse output functions: PWM and Pulse
train output (PTO). PTO is used by the motion contro~ instructions. You can assign each pulse generator
to either PWM or PTO, but not both at the same time.
The two pulse generators are mapped to specific digital outputs as shown in the above table. You can
use onboard CPU outputs, oryou can use the optional signal board outputs. The output point numbers
are shown in the above table (assuming the default output configuration). If you have changed the output
point numbering, then the output point numbers will be those you assigned. Regardless, PTOI/PWM1
uses the first two digital outputs, and PTO2/PWM2 uses the next two digital outputs, either on the CPU or
on the attached signal board. Note that PWM requires only one output, while PTO can optionally use two
outputs per channel. If an output is not required for a pulse function, it is available for other uses.
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5. PID Controller
SIEMENS
, Pulse Width Modulation (PWM)
¯ PID Controller
, Exercise PID
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6. Closed Loop Controlled System
Controller
w e
actuator
Controller PWM
SIEMENS
Controlled
(disturbanCe)
z
Fan
High Speed Counter
A block diagram showing a PID closed loop control implementation where the measured feedback is
compared with the setpoint to determine the error. The error is then used by the PID loop algorithm to
adjust the PID output to eliminate the error.
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7. Closed Loop Controlled System
SIEMENS
actuator
(disturbance)
Z
Controlled
Controller PWM Fan
High Speed Counter
The PID controller is implemented in the 1200 CPU by the PID Compact instruction box located in the
Extended Instruction Task Card. This PID control loop will use-a PWM instruction and a High Speed
Counter instruction to control the speed of the fan motor on the training simulator.
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8. SIEMENS
Controller Build
PID Loop Controller
The PID Compact instruction provides the CPU 1200 user with a PID loop control algorithm that has
automati’~ and manual mode available along with self tuning optimization ¯ The pID_Compact instruction
box has inputs where the setpoint and process variable (actual value) are connected. The input
connections provide process data for the PID algorithm which then drives the output to the final element.
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9. Controller Build
SIEMENS
The PiD Compact instruction is programmed in a Cyclic Interrupt OB for execution which executes at a
specifie~-cycle time. The cycle time can be viewed or changed in the prope[ties of the Cyclic Interrupt
OB. During the programming of the PID_Compact instruction a data block is created and automatically
placed in the Technological Object folder.
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10. Add Cyclic Interrupt OB
SIEMENS
Adding and configuring the Cyclic Interrupt OB through the Add new block prompt in the Program blocks
folder. When the Add new block dialog box opens, the OB button is selected followed by selecting the
Cyclic interrupt, the program language, the OB number, and cyclic execution time; click OK to complete
the configuration.
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11. Add PID Controller
SIEMENS
Open the Cyclic Interrupt OB to view the LAD networks, then open the Extended Instructions and drag
and drop the PID Compact instruction on to the open LAD network. A dialog box will open where an
instance data bloc-k will be configured and be attached to the pID_Compact instruction box.
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12. Compact and Expanded View
SIEMENS
PID Compact instruction box can be expanded or collapsed by clicking on the little arrow head at the
bottom of the PID_Compact instruction box. tn the expanded state, additional inputs/outputs are exposed
and connections can be made then the instruction box can be collapsed to conserve space.
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13. SIEMENS
input:
"Automatic Mode"
.= from the user program
Analog Input
:= "Manual mode"
~dable for °Manuat Mode"
restart counter
:= "inactive Mode"
The PID Compact instruction inputs not only provide connection points for the controlled process
setpoint-~nd measured feedback, it also provides an input connection to change the state of the
controller mode. 1he PID controller can be in manual mode, which is the default mode, or auto mode.
When the PID controller is in auto mode, the P[D controller automatically adjusts the loop output to
maintains the loop’s setpoint value, such as a desired temperature.
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14. The PID Compact instruction outputs not only provides a connection point for the controlled process final
element-~ut it also provides different types of output connections to match what it is driving, such as an
output for pWM or an output as a Real number data type. Limit and warning alarm bits can be
configured along with locations that record the mode of the controller and displays error codes in the
event of an error condition which makes troubleshooting easier.
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15. Formal Parameter - State
SIEMENS
The chart above shows the numerical codes that are displayed in the State output which describes the
Status of the PID controller. A memory location must be configured to State output in order for the
numerical codes to be displayed.
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16. SIEMENS
Define Variable
Symbolic programming provides an advantage, you will find the program much clearer and easier to read
if you use symbols (for example fan) instead of the absolute addresses. To allow the use of symbols, you
can enter a name, the absolute address, the data type and a comment for every address used. Once
you have defined a symbol, it can be used throughout the entire user program of a programmable
module; symbolic names are entered in the PLC tags folder.
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17. Clicking on the Configuration button in the upper right hand corner of the pID_Compact instruction box
opens to the configuration topics such as Basic parameters, Input scaling, and Advanced settings which
stores the loop tuning parameters for the pID_Compact box instruction.
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18. SIEMENS
Input Scaling
Configuring the Input/Output fields in the dialog box is made easier by the following special features,
The Intellisence feature aids in configuration by providing a list of
Intellisense and automatic connection, slide
only valid possible connection variables (symbolic names) like the Input value input shown in the
above. The automatically connection feature then connects that symbolic variable to the correct input or
output of the pID_Compact box instruction.
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19. SIEMENS
Input Scaling
The input scaling takes the raw data value from the analog input signal such as 0 to 27648 or -27648 to
+27648 and assigns the desired engineering units. So that the value entered at the upper limit is now
associated with the max raw data value of 27648 and the value entered at the lower limit is nowassociated with the minimum raw data value of 0 or -27648. This is dependent on the type of analog
signal entering the analog card.
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20. Input Monitoring
SIEMENS
Numerical alarm warning points are entered into the input monitoring menu prompt and will be used to
set alarm bits that can be configured on the pID_Compact instruction box.
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21. Set PWM Hysteresis
SIEMENS
Edit the PWM limits menu prompt to enter the minimum on time and the minimum off time of the output
signal of the piD_Compact instruction. PID_Compact instruction will not change the signal Time-on or
the signal Time-off past these limits.
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22. Edit the Output limit menu prompt to enter an upper limit and a low limit for the PID_Compact instruction
to use in the function calculation.
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23. SIEMENS
If the PID tuning parameters are known, the PID tuning parameters values can be set manually through
this configuration dialog box and then the check box should be checked in order to utilize those
parameters, as shown in the slide. The PID tuning parameters can be determined by using the auto-tune
feature.
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24. Optional warning alarm bit variable can be configured in the piD_Compact instruction box to provide
inputs to logic operation and/or drive animation on the HML
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25. SIEMENS
Commissioning - Workflow
¯ Download Projected controller +
technological object
¯ start commissioning
¯ start scope
, Run "Startup Tuning"
(turn-over tangent method)
¯ Run "Tuning in Run"
(Step response)
¯ Upload PiD-parameter
to project
¯ activate automatic mode
Set [oPID_compact-DB°’sRet’i-M°de] to mode 3
After the PID Compact instruction box has been configured and compiled, the program can be download
to the 1200 C-PU then tested through the Commissioning function as listed in the slide.
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26. Invoke the Commissioning function by clicking the Commissioning button in the upper right hand corner
of pID_Compact instruction box,
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27. The Scope has buttons where you can start/stop the measurement and the ability to select the sample
time in ms through the provided sample time field.
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28. The Commissioning scope has several very useful features such as fix scale.
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29. The Commissioning scope has several very useful features such as the tool to Zoom in.
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30. The Commissioning scope has several ve~ useful features such as the too[ to Zoom out.
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31. SIEMENS
The Commissioning scope has several very useful features such as a window that displays the current
values.
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32. SIEMENS
Commissioning
The Commissioning Scope has several features such as the auto tuner function which calculates the PiD
loop tuning parameter then uploads them to the PID loop controller, Clicking the button in the
optimization window begins the process.
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33. Commissioning - Kind of Commissioning
SIEMENS
]he auto tuner creates a step change in the process them monitors the response of the process to
determine to determine the PID loop tuning parameters. The step change causes the process to oscillate
as illustrated in the graphic above and illustrated in the slides that follow.
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34. ’ The auto tuner creates a step change in the process them monitors the response of the process to
determine the PID loop tuning parameters. After looking at the setpoint, input, and output, in the graph
you notice that the PID setpoint was changed and the PID input and PID output react to the change. A
progress bar displays the progress time until the function is completed.
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35. "The step change causes the process to oscillate as illustrated in the graphic above.
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36. SIEMENS
Commissioning - Online
The auto tuner calculates the PID tuning parameters then it stores them in PID_Compact data block that
has been associated with PID instruction.
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37. PID Exercise
SIEMENS
, Pulse Width Modulation (PWM)
,, PID Controller
¯ Exercise PID
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38. Exercise - PID Controller
SIEMENS
Hands-on
Let’s just do it ..... the lab for you
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39. Task
Process
Add new project
2.
3.
4.
5.
Click in the Task menu Project > New
Name the project ,,Project_exemise_PID_loop"
Start "Add new device"
Add "Unspecific CPU"
Detect (upload) "hardware configuration"
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40. Task
ProceSs
Define variable
6.
Start Tag-Editor with a double click
7,
Set up the displayed tags.
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41. Hands-on
Task
Process
Implement program code n Ma’n and add ’cycl’c OB’
9,
10.
11.
12,
13.
14.
15.
Open "Main" (OB1)
Add program code like displayed
Add new block out of the project tree
Select "cyclic interrupt OB"
Type in the name "cyclic interrupt._PID controlleF’
Give the OB the manual block number "300"
Define the scan time with "lOOms"
Hit the Checkbox "Add new and open"
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42. Task
Process
Add PID Controller
16.
17.
18.
Add "PID_Compact" block out of the extended instructions
in the "cyclic interrupt_PID controller’ (OB300).
Give the "InstanceDB / Technological object" a name.
Add "Instance DB/Technological object" by hitting OK Button.
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43. Task
Process
Parameterize the PID Controller
19.
20.
21.
22.
23.
24.
25.
26.
Mark the "PID_Compact" block
Select the point §basic settings"
Select as controller type "Temperature"
Select as unit "C°".
Activate the checkbox "Invert PID-Controller output."
Set the Set-point to "85."
Select "Input_PER" for the Input value and
type in the variable "heat_sensor" (IW66),
Select "OutpuLPER" for the Output value and
type in the variable "fan" (QWS0) an.
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44. Exercise 8-1: Scale the Inputs
SIEMENS
Task Input scaling
Process 27.
28.
29.
30.
Select the point "input scaling".
Select for the Scaled upper value "100°C.’’
Select for the Scaled lower value "0°C."
Select for the analog/d{gital converter the values
"0" for the lower limit and "27648" for the upper limit.
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45. SIEMENS
Exercise 8-1: Download whole project
Hands-o~}
Task Download the whole project
Process 31.
32.
"Save" the project.
Download "All" to the PLC
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46. SIEMENS
Task Commissioning the PID Controller
Process 33.
34.
35.
36.
Start the "Commissioning"
Start the scope.
Select "Tuning in run" and hit the "Start tuning" button
After successful commissioning hit the button
"Upload PID parameters to project" and save the project.
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