Logix5000 Controllers General Instructions - SLAC Confluence

422 Sequencer Instructions (SQI, SQO, SQL)Sequencer Input (SQI)The SQI instruction detects when a step is complete in a sequencepair of SQO/SQI instructions.Operands:Relay LadderOperand Type Format DescriptionArray DINT array tag sequencer arrayspecify the first element of the sequencerarraydo not use CONTROL.POS in the subscriptMaskSINTtagwhich bits to block or passINTimmediateSourceDINTA SINT or INT tag converts to a DINT value by sign-extension.SINT tag input data for the sequencer arrayINTDINTA SINT or INT tag converts to a DINT value by sign-extension.Control CONTROL tag control structure for the operationtypically use the same CONTROL as the SQOand SQL instructionsLength DINT immediate number of elements in the Array (sequencertable) to comparePosition DINT immediate current position in the arrayinitial value is typically 0CONTROL StructureMnemonic Data Type Description.ER BOOL The error bit is set when .LEN ≤ 0, .POS < 0, or .POS > .LEN..LEN DINT The length specifies the number of steps in the sequencer array..POS DINT The position identifies the element that the instruction is currently comparing.Publication 1756-RM003I-EN-P - January 2007