Allen-Bradley Logix5000 Reference Manual page 452

Chapter 11 Program Control Instructions (JMP, LBL, JSR, RET, SBR, JXR, TND, MCR, UID, UIE, AFI, NOP, EOT, SFP, SFR, EVENT)
Condition:
Prescan
Rung-condition-in is false
Rung-condition-in is true
Postscan
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Execution:
Relay Ladder Action
The rung-condition-out is set to false.
The rung-condition-out is set to false.
The rung-condition-out is set to true.
Execution jumps to the rung that contains the LBL instruction with the referenced label name.
The rung-condition-out is set to false.
Example:
When the JMP instruction is enabled, execution jumps over successive rungs of
logic until it reaches the rung that contains the LBL instruction
with label_20.
[Other Rungs of Code]
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011