Allen-Bradley Logix5000 Reference Manual page 345

Array (File)/Misc. Instructions (FAL, FSC, COP, CPS, FLL, AVE, SRT, STD, SIZE)
The following timing diagram shows the relationship between status bits and
instruction operation. When the instruction execution is complete, the .DN bit is
set. The .DN bit, the .EN bit, and the .POS value are cleared when the rung-
condition-in is false. Only then can another execution of the instruction be
triggered by a false-to-true transition of rung-condition-in.
Rung-condition-in
.EN Bit
.DN Bit
Scan Of The Instruction
Operation Complete
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
One
Scan
Chapter 8
Clears status bits and clears
.POS value.
No execution occurs.
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