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Logix5000 Controllers General Instructions - SLAC Confluence

Logix5000 Controllers General Instructions - SLAC Confluence

Logix5000 Controllers General Instructions - SLAC Confluence

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108 Timer and Counter <strong>Instructions</strong> (TON, TOF, RTO, TONR, TOFR, RTOR, CTU, CTD, CTUD, RES)Execution:ConditionprescanRelay Ladder ActionThe .EN, .TT, and .DN bits are cleared.The .ACC value is not modified.rung-condition-in is falseThe rung-condition-out is set to false.The .EN and .TT bits are cleared.The .DN bit is not modified.The .ACC value is not modified.The rung-condition-out is set to false.rung-condition-in is trueexamine .DN bit.DN bit = 1.DN bit = 0examine .EN bit.EN bit = 0.EN bit is set.TT bit is set.EN bit = 1.TT bit is set.ACC = .ACC + (current_time - last_time)examine .ACC.ACC < .PRE.ACC ≥ .PRE.DN is set.TT bit is cleared.ACC valuerolls overnoyesrung-condition-out is set totrue.ACC = 2,147,483,647endpostscanThe rung-condition-out is set to false.Publication 1756-RM003I-EN-P - January 2007

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