Subroutine program starts getting scanned by CPU Case 3: When Return is executed Ouput of U:3 ladder get freezed & remain at that state Subroutine program wont be scanned by CPU Main Program Subroutine Case 2: When Subroutine is called U:3 i.e. Programming PLC Flow Control Instructions Jump Subroutine & Return Case 1: When Subroutine is not called U:3 i.e. 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: Math Error Note: In Allen Bradley, Fault occurs when calculation value exceeds 32767 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 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
Programming PLC MVM = Masked Move N7:5 = N7:0 bit wise AND with N7:2 Example: When Input is energized, MVM will be performed Programming PLC Negate N7:0= 44 N7:0 = -44 (after command executed) Example: When Input is energized, Negate function will be performed Programming PLC Square Root N7:1= 49 N7:8 = 7 (after command executed) Example: When Input is energized, Square root function will be performed Programming PLC Scale N7:9= + 5 N7:9 = 27 Example: When Input is energized, Scaling will be done
Programming PLC MEQ = Masked Equal to Example: Output will be energized when N7:0 AND with N7:1 equals N7:5 Bit wise multiplication Programming PLC Greater Than or equal to >= Example: >= Preset Counter - Down Done bit is ON when Acc. Programming PLC Counter Up Done bit is ON when Acc. Programming PLC Timer ON DELAY Timer Reset Timer OFF DELAY Timer Retentive Type Programming PLC Normally Open/ Examine if Open Output Energize One Shot Rising Normally Close/ Examine if Close Output Latched Output Unlatched Parallel Rung at Input Parallel Rung at Output Programming PLC Control Registers R6: 0 Addressing the PLC Addressing the PLC Outputs O: 0/0 First Output O: 0/1 Second Output
Addressing the PLC Inputs I: 0/0 First Input I: 0/1 Second Input This is a PLC Input Terminals Programming Cable Output Terminals Power 24 VDC
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