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In Allen Bradley PLC programs—especially those built using RSLogix 500—the jump instruction (commonly known as the JMP instruction) is used to alter the normal, sequential flow of ladder logic. Here are some key points about the JMP instruction in this context:

Purpose and Function

Unconditional Branching: The JMP instruction is used to make an unconditional jump from one part of the program to another. When the JMP rung is executed, the program counter is set to a designated destination, skipping any rungs in between.

Label or Destination: You typically specify a destination or a label (often a numeric identifier or a pre-defined jump target) that tells the PLC where to continue execution.

Efficiency in Certain Routines: In some cases—such as handling errors or skipping over parts of a routine that are not relevant under certain conditions—the JMP can simplify the logic by avoiding redundant checks.