How to use Sub Routines with Allen Bradley PLC
Sub routines are sub programs in a PLC project. We can split the whole program by its function or sequence. We can call the sub programs from main page using
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Allen Bradley PLC Subroutines
JSR, SBR, and RET instructions are used to direct the controller to execute a separate subroutine file within the ladder program and return to the instruction following the JSR instruction.