Allen-Bradley Logix5000 Reference Manual

426 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 9 Array (File)/Shift Instructions (BSL, BSR, FFL, FFU, LFL, LFU)
Postscan The rung-condition-out is set to false.
Condition: Relay Ladder Action
Rung-condition-in is true.
End
Rung-condition-out is set
to true.
Examine .EN bit.
.EN = 0
.EN = 1
.EN bit is set.
.LEN < 0
Yes
No
.POS < 0
Yes
No
.EM bit is set.
.DN is set.
.EM bit is cleared.
.DN is cleared.
.POS = .POS + 1
.POS ≥ .LEN
Yes
No
.DN bit is set.
.POS Or
.LEN > Size Of
Array
Yes
No
Major Fault
.POS > .LEN
Yes
No
.POS = .POS - 1
LIFO[.POS - 1] = Source
.LEN < 0
Yes
No
.POS < 0
Yes
No
.EM bit is cleared.
.DN is cleared.
.POS = 0
Yes
No
.EM bit is set
.POS ≥ .LEN
Yes
No
.DN bit is set
.EM bit is set.
.DN is set.

Allen-Bradley Logix5000 Specifications

General

Brand	Allen-Bradley
Model	Logix5000
Category	Controller
Language	English