430 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 9 Array (File)/Shift Instructions (BSL, BSR, FFL, FFU, LFL, LFU)
Execution:
Condition Relay Ladder Action
Prescan
End
.EU bit is set to prevent a false
unload when scan begins.
rung-condition-out is set to
false.
.LEN < 0
Yes
No
.POS < 0
Yes
.EM is cleared.
.DN is cleared
No
.POS = 0
Yes
No
.EM is set.
.POS
≥
.LEN
Yes
no
.DN is set.
.EM is set
.DN is set
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