Allen-Bradley Logix5000 Reference Manual page 498

Chapter 13 Special Instructions (FBC, DDT, DTR, PID)
Condition
Rung-condition-in is true.
Examine
compare.EN bit.
Compare.EN = 0
Compare EN bit is set.
Exit
Rung-condition-out is set
to true.
End
498
Relay Ladder Action
Compare.EN = 1
Examine
compare.DN bit.
Compare.DN = 0
Compare.ER bit is cleared.
Compare.FD bit is cleared.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Goto
Exit
Compare.DN = 1
Goto
Exit
Compare.LEN ≤ 0
No
Yes
Compare.POS < 0
No
Compare
page 499
Yes
Compare.ER bit is set.
Goto
Exit