Logix5000 Controllers General Instructions - SLAC Confluence

334 Array (File)/Misc. Instructions (FAL, FSC, COP, CPS, FLL, AVE, SRT, STD, SIZE)Execution is triggered when the rung-condition-in goes from false totrue. Once triggered, the instruction is executed each time it isscanned for the number of scans necessary to complete operating onthe entire array. Once triggered, rung-condition-in can changerepeatedly without interrupting execution of the instruction.one scansecond scannext scan16641IMPORTANTAvoid using the results of a file instruction operating innumerical mode until the .DN bit is set.The following timing diagram shows the relationship between statusbits and instruction operation. When the instruction execution iscomplete, the .DN bit is set.rung is true at completionmultiple scansrung is false at completionmultiple scansrung-condition-in.EN bit.DN bitscan of the instructionoperation completeoperation complete40013clears status bits andclears .POS valueclears status bits andclears .POS valuePublication 1756-RM003I-EN-P - January 2007