244 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 5 Compare Instructions (CMP, EQU, GEQ, GRT, LEQ, LES, LIM, MEQ, NEQ)
Fault Conditions: None
Execution:
Relay Ladder
Function Block
Condition Action
Prescan The rung-condition-out is set to false.
Rung-condition-in is false The rung-condition-out is set to false.
Postscan The rung-condition-out is set to false.
Rung-condition-in is true
End
Source A < Source B
Yes
no
Rung-condition-out is set
to true.
Rung-condition-out is set
to false.
Condition: Action
Prescan No action taken.
Instruction first scan No action taken.
Instruction first run No action taken.
EnableIn is false EnableOut is cleared.
EnableIn is true The instruction executes.
EnableOut is set.
Postscan No action taken.
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