Relay Ladder; Function Block - Allen-Bradley Logix5000 Reference Manual
1756 controllogix,
1768 compactlogix,
1769 compactlogix,
1789 softlogix,
1794 flexlogix,
powerflex 700s with drivelogix
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Also See for Logix5000:
- Programming manual (92 pages) ,
- User manual (84 pages) ,
- Application book (56 pages)
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Chapter 5
Compare Instructions (CMP, EQU, GEQ, GRT, LEQ, LES, LIM, MEQ, NEQ)
Fault Conditions:
Condition
Prescan
Rung-condition-in is false
Rung-condition-in is true
Source A < Source B
Rung-condition-out is set
Postscan
Condition:
Prescan
Instruction first scan
Instruction first run
EnableIn is false
EnableIn is true
Postscan
244
None
Execution:
Relay Ladder
Action
The rung-condition-out is set to false.
The rung-condition-out is set to false.
Yes
no
to false.
The rung-condition-out is set to false.
Function Block
Action
No action taken.
No action taken.
No action taken.
EnableOut is cleared.
The instruction executes.
EnableOut is set.
No action taken.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Rung-condition-out is set
to true.
End
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