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PLCAllen Bradley Micrologix

www.nfiautomation.org

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Understanding PLC


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Understanding PLC


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Wiring PLC


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Wiring PLC


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Wiring PLC


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Wiring PLC


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Wiring PLC


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Wiring PLC


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Wiring PLC


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PLC Ladder Logic


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Addressing the PLC

InputsI: 0/0 First Input I: 0/1 Second Input


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Addressing the PLC

OutputsO: 0/0 First Output O: 0/1 Second Output


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Addressing the PLCInternal BitsB3: 0/0


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Addressing the PLCTimersT4: 0


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Addressing the PLCCountersC5: 0

i


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Addressing the PLCControl RegistersR6: 0

Add i th PLC


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Addressing the PLCData RegisterN7: 0

Add i th PLC


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Addressing the PLCInstruction Palette

P i PLC


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Programming PLCAdd new Rung

P i PLC


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Programming PLCParallel Rung at Input

Parallel Rung at Output

P i PLC


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Programming PLCNormally Open/Examine if Open

Normally Close/Examine if Close

Output Energize Output Latched Output Unlatched

One Shot Rising

P i PLC


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Programming PLCTimer ON DELAY

Timer OFF DELAY

Timer Retentive Type

Timer Reset


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Programming PLC


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Programming PLCEqualizer

Example:

Programming PLC


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Programming PLCNot Equal to

Example:

Programming PLC


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Programming PLCLess Than

Example:

Programming PLC


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Programming PLCGreater Than or equal to >=

Example:

Programming PLC


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Programming PLCGreater Than or equal to >=

Example:

Programming PLC


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Programming PLCMEQ = Masked Equal to

Example:

Output will be energized when N7:0 AND with N7:1 equals N7:5Bit wise multiplication

Programming PLC


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Programming PLCScale

Example:

When Input is energized, Scaling will be done

N7:9= {N7:0x (Rate/10000)} + offset

N7:9 = {44x (5000/10000)} + 5N7:9 = 27


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Programming PLC


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Programming PLCNegate

Example:

When Input is energized, Negate function will be performed

N7:0= 44

N7:0 = -44 (after command executed)

Programming PLC


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Programming PLCMVM = Masked Move

Example:

When Input is energized, MVM will be performed

N7:5 = N7:0 bit wise AND with N7:2

Programming PLC


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Programming PLCCopy File

Example:

When Input is energized, Copy Function will be performed

N7:0 ------------ N7:10N7:1 ------------ N7:11N7:2 ------------ N7:12N7:3 ------------ N7:13N7:4 ------------ N7:14

Programming PLC


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Programming PLCFill File

Example:

When Input is energized, Fill Function will be performed

N7:0 ------------ N7:10N7:0 ------------ N7:11N7:0 ------------ N7:12N7:0 ------------ N7:13N7:0 ------------ N7:14N7:0 ------------ N7:15


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Note:

In Allen Bradley, Fault occurs when calculation value exceeds

32767

Math Error

Programming PLC


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Programming PLCFlow Control Instructions

Example:

Jump & LabelCase 1: When Jump is not enabled

When I:0/5 is True/False B3:0 is On/OffWhen 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 EnabledWhen I:0/5 is True/False B3:0 will be at last stateNo effectWhen I:0/4 is True/False B3:1 will be at last stateNo effect

When I:0/3 is True/False O:0/2 is On/Off

Programming PLC


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Programming PLCFlow Control Instructions

Subroutine

Jump Subroutine & Return

Main Program

Case 1: When Subroutine is not calledU:3 i.e. Subroutine program wont be scanned by CPU

Case 2: When Subroutine is calledU:3 i.e. Subroutine program starts getting scanned by CPU

Case 3: When Return is executedOuput of U:3 ladder get freezed & remain at that state


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Programming PLC


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Programming PLCTemporary END

Example:

When I:0/5 is energized ladder below TND is not scanned by CPU

Programming PLC


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Programming PLCSequencer Output

Example:

File is the address of the sequencer file. Make sure to use the file indicator (#). This file stores the reference data formonitoring inputs.Maskis a hexadecimal code or the address of the mask word or file through which the instruction moves data. Ifthe 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 itssequencer file.Control is the instructions address and control element (3 words) that stores the status byte of the instruction, thelength of the file, and the position in the file. Do not use this address for any other instruction. Status bits in thecontrol file includeLength is the number of steps of the sequencer file starting at position 1. Maximum = 255 words (104 words whenusing the MicroLogix controller). Position 0 is the startup position. The instruction resets (wraps) to position 1 at eachcycle completion.Position is the word location or step in the sequencer file from/to which the instruction moves data. A position valuethat points past the end of the programmed file causes a runtime major error to occur.

Programming PLC


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Programming PLCSequencer Output

Example:

Programming PLC


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Programming PLCSequencer Compare

Example:

R6:3/FD is bit which is ON when comparison is TRUEi.e. When I:0.0 masked with B3:1 & result equals B3:0

This command can be used for diagnostic purpose such that to checkWhether specified inputs are ON or OFF at various stages of sequenceEx Homing, Station 1, Station 2 etc.

Programming PLC


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g gSequencer Load

Example:

This command stores the status of Inputs at N7:0 till number of positionmentioned. In this case upto N7:4

Position 1 N7:1Position 2 N7:2Position 3 N7:3Position 4 N7:4 Values get over rite when cycle completes

L 4 PLC i D

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