Allen-Bradley Logix5000 Reference Manual page 506

Chapter 13 Special Instructions (FBC, DDT, DTR, PID)
Condition:
Compare
Compare.POS ≥
Compare.LEN
No
Source[compare.POS] =
Reference[compare.POS]
Yes
Compare.POS =
Compare.POS + 1
Postscan
506
Relay Ladder Action
Yes Compare.POS = compare.LEN
Compare.DN bit is set.
Compare.FD bit is set.
No
Reference[compare.POS]
= Source[compare.POS]
Major Fault
The rung-condition-out is set to false.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
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Exit
page 505
Result.DN = 1
Examine result.DN
bit.
Result.DN = 0
Yes
Result.POS < 0
No
Yes
Result.LEN ≤ 0
no
Yes
Result.POS >
Size of result array
no
Result[result.POS] = Compare.POS
Result.POS = Result.POS + 1
No
Result.POS ≥
Result.LEN
Yes
Result.DN bit is set.
Result.DN bit is cleared.
Result.POS value is
cleared.
Compare.ER bit is set.
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Exit
page 498