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1. PLC
Allen Bradley Micrologix
www.nfiautomation.org
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2. This is a PLC
Input Terminals
Programming Cable
Output Terminals
Power 24 VDC

3. Understanding PLC

4. Understanding PLC

5. Wiring PLC

6. Wiring PLC

7. Wiring PLC

8. Wiring PLC

9. Wiring PLC

10. Wiring PLC

11. Wiring PLC

12. PLC Ladder Logic

13. Addressing the PLC
Inputs
I: 0/0
First Input
I: 0/1
Second Input

14. Addressing the PLC
Outputs
O: 0/0
First Output
O: 0/1
Second Output

15. Internal Bits
B3: 0/0
Addressing the PLC

16. Timers
T4: 0
Addressing the PLC

17. Counters
C5: 0
Addressing the PLC

18. Control Registers
R6: 0
Addressing the PLC

19. Data Register
N7: 0
Addressing the PLC

20. Instruction Palette
Addressing the PLC

21. Add new Rung
Programming PLC

22. Parallel Rung at Input
Parallel Rung at Output
Programming PLC

23. Programming PLC
Normally Open/
Examine if Open
Output Energize
One Shot Rising
Normally Close/
Examine if Close
Output Latched
Output Unlatched

24. Programming PLC
Timer – ON DELAY
Timer Reset
Timer – OFF DELAY
Timer – Retentive Type

25. Programming PLC
Counter – Up
Done bit is ON when Acc. >= Preset
Counter - Down
Done bit is ON when Acc. >= Preset
Counter Reset

26. Programming PLC
Limit Test
Example:

27. Programming PLC
Equalizer
Example:

28. Programming PLC
Not Equal to
Example:

29. Programming PLC
Less Than <
Example:

30. Programming PLC
Less Than or Equal to <=
Example:

31. Programming PLC
Greater Than >
Example:

32. Programming PLC
Greater Than or equal to >=
Example:

33. Programming PLC
Greater Than or equal to >=
Example:

34. Programming PLC
MEQ = Masked Equal to
Example:
Output will be energized when N7:0 “AND” with N7:1 equals N7:5
Bit wise multiplication

35. Programming PLC
Scale
N7:9= {N7:0 x (Rate/10000)} + offset
N7:9 = {44 x (5000/10000)} + 5
N7:9 = 27
Example:
When Input is energized, Scaling will be done

36. Programming PLC
Square Root
N7:1= 49
N7:8 = 7 (after command executed)
Example:
When Input is energized, Square root function will be performed

37. Programming PLC
Negate
N7:0= 44
N7:0 = -44 (after command executed)
Example:
When Input is energized, Negate function will be performed

38. Programming PLC
MVM = Masked Move
N7:5 = N7:0 bit wise AND with N7:2
Example:
When Input is energized, MVM will be performed

39. Programming PLC
Copy File
N7:0 ------------ N7:10
N7:1 ------------ N7:11
N7:2 ------------ N7:12
N7:3 ------------ N7:13
N7:4 ------------ N7:14
Example:
When Input is energized, Copy Function will be performed

40. Programming PLC
Fill File
N7:0 ------------ N7:10
N7:0 ------------ N7:11
N7:0 ------------ N7:12
N7:0 ------------ N7:13
N7:0 ------------ N7:14
N7:0 ------------ N7:15
Example:
When Input is energized, Fill Function will be performed

41. Math Error
Note:
In Allen Bradley, Fault occurs when calculation value exceeds
32767

42. Programming PLC
Flow Control Instructions
Jump & Label
Case 1: When Jump is not enabled
When I:0/5 is True/False B3:0 is On/Off
When I:0/4 is True/False B3:1 is On/Off
When I:0/3 is True/False O:0/2 is On/Off
Case 2: When Jump is Enabled
When I:0/5 is True/False B3:0 will be at last state – No effect
When I:0/4 is True/False B3:1 will be at last state – No effect
When I:0/3 is True/False O:0/2 is On/Off
Example:

43. Programming PLC
Flow Control Instructions
Jump Subroutine & Return
Case 1: When Subroutine is not called
U:3 i.e. Subroutine program wont be scanned by CPU
Main Program
Subroutine
Case 2: When Subroutine is called
U:3 i.e. Subroutine program starts getting scanned by CPU
Case 3: When Return is executed
Ouput of U:3 ladder get freezed & remain at that state

44. Programming PLC
Temporary END
Example:
When I:0/5 is energized ladder below TND is not scanned by CPU

45. Programming PLC
Temporary END
Example:
When I:0/5 is energized ladder below TND is not scanned by CPU

46. Programming PLC
Sequencer Output
Example:
File is the address of the sequencer file. Make sure to use the file indicator (#). This file stores the reference data for
monitoring inputs.
Mask is a hexadecimal code or the address of the mask word or file through which the instruction moves data. If
the mask is a file, its length will be equal to the length of the sequencer file. The two files track automatically.
You can enter the code in binary, decimal, or hexadecimal.
Destination is the address of the output word or file for a SQO to which the instruction moves data from its
sequencer file.
Control is the instruction’s address and control element (3 words) that stores the status byte of the instruction, the
length of the file, and the position in the file. Do not use this address for any other instruction. Status bits in the
control file include
Length is the number of steps of the sequencer file starting at position 1. Maximum = 255 words (104 words when
using the MicroLogix controller). Position 0 is the startup position. The instruction resets (wraps) to position 1 at each
cycle completion.
Position is the word location or step in the sequencer file from/to which the instruction moves data. A position value
that points past the end of the programmed file causes a runtime major error to occur.

47. Programming PLC
Sequencer Output
Example:

48. Programming PLC
Sequencer Compare
Example:
R6:3/FD is bit which is ON when comparison is TRUE
i.e. When I:0.0 masked with B3:1 & result equals B3:0
This command can be used for diagnostic purpose such that to check
Whether specified inputs are ON or OFF at various stages of sequence
Ex Homing, Station 1, Station 2 etc.

49. Programming PLC
Sequencer Load
Example:
This command stores the status of Inputs at N7:0 till number of position
mentioned. In this case upto N7:4
Position 1  N7:1
Position 2  N7:2
Position 3  N7:3
Position 4  N7:4
Values get over rite when cycle completes

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52. Thanks
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