Logix5000 Controllers General Instructions - SLAC Confluence

72 Bit Instructions (XIC, XIO, OTE, OTL, OTU, ONS, OSR, OSF, OSRI, OSFI)Examine If Open (XIO)The XIO instruction examines the data bit to see if it is cleared.Operands:Relay LadderOperand Type Format Descriptiondata bit BOOL tag bit to be testedStructured TextStructured text does not have an XIO instruction, but you can achievethe same results using an IF...THEN construct.IF NOT data_bit THEN;END_IF;See Appendix B for information on the syntax of constructs withinstructured text.Description:Arithmetic Status Flags:Fault Conditions:The XIO instruction examines the data bit to see if it is cleared.not affectednoneExecution:Conditionprescanrung-condition-in is falserung-condition-in is trueRelay Ladder ActionThe rung-condition-out is set to false.The rung-condition-out is set to false.examine data bitdata bit = 0rung-condition-out isset to truedata bit = 1rung-condition-out is setto falseendpostscanThe rung-condition-out is set to false.Publication 1756-RM003I-EN-P - January 2007