Allen-Bradley Logix5000 Reference Manual

432 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 .EU bit.
.EU = 0
.EU = 1
.EU 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.
.LEN > Size Of
Array
Yes
No
Major Fault
.POS ≤ 1
Yes
No
.EM bit is set.
.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.
.POS < 1
Yes
No
.POS > . LEN
Yes
No
.POS = .LEN
Destination = 0
Destination = LIFO[control.POS]
LIFO[control.POS) = 0
.POS = .POS -1

Allen-Bradley Logix5000 Specifications

General

Brand	Allen-Bradley
Model	Logix5000
Category	Controller
Language	English