498 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 13 Special Instructions (FBC, DDT, DTR, PID)
Condition Relay Ladder Action
Examine
compare.EN bit.
Compare.EN = 1
Compare.EN = 0
Rung-condition-in is true.
Examine
compare.DN bit.
Compare.DN = 1
Compare.DN = 0
Compare EN bit is set.
Compare.ER bit is cleared.
Compare.FD bit is cleared.
Compare.LEN ≤ 0
Yes
No
Compare.POS < 0
Yes
No
Compare.ER bit is set.
Compare
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End
Rung-condition-out is set
to true.
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Exit
Exit
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