Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 505
Special Instructions (FBC, DDT, DTR, PID) Chapter 13
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 bit = 1
compare.DN bit = 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
page 506
End
Rung-condition-out is set
to true.
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Exit
Exit
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