Logix5000 Controllers General Instructions - SLAC Confluence

84 Bit Instructions (XIC, XIO, OTE, OTL, OTU, ONS, OSR, OSF, OSRI, OSFI)Execution:ConditionprescanRelay Ladder ActionThe storage bit is set to prevent an invalid trigger during the first scan.The output bit is cleared.rung-condition-in is falseThe rung-condition-out is set to false.The storage bit is cleared.The output bit is not modified.The rung-condition-out is set to false.rung-condition-in is trueexamine storage bitstorage bit = 0storage bit is setoutput bit is setstorage bit = 1storage bit remains setoutput bit is clearedendpostscanThe storage bit is cleared.The output bit is not modified.The rung-condition-out is set to false.Example:Each time limit_switch_1 goes from cleared to set, the OSR instructionsets output_bit_1 and the ADD instruction increments sum by 5. Aslong as limit_switch_1 stays set, sum stays the same value. Thelimit_switch_1 must go from cleared to set again for sum to beincremented again. You can use output_bit_1 on multiple rungs totrigger other operationsPublication 1756-RM003I-EN-P - January 2007