Logix5000 Controllers General Instructions - SLAC Confluence

412 Array (File)/Shift Instructions (BSL, BSR, FFL, FFU, LFL, LFU)Condition:Relay Ladder Actionrung-condition-in is trueexamine .EN bit.EN = 0.EN bit is set .LEN < 0yes.EN = 1no.LEN < 0yes.POS < 0yesnono.POS < 0yes.EM bit is cleared.DN is cleared.EM bit is setno.EM bit is cleared.EM bit is set.POS ≥ .LENyes.DN bit is setno.POS = 0yes.EM bit is setno.POS or.LEN > size ofarrayyesmajor faultno.POS ≥ .LENyes.DN bit is setno.POS > .LENyes.POS = .POS - 1noLIFO[.POS - 1] = sourcerung-condition-out is set totrueendpostscanThe rung-condition-out is set to false.Publication 1756-RM003I-EN-P - January 2007