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Logix5000 Controllers General Instructions - SLAC Confluence

Logix5000 Controllers General Instructions - SLAC Confluence

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Timer and Counter <strong>Instructions</strong> (TON, TOF, RTO, TONR, TOFR, RTOR, CTU, CTD, CTUD, RES) 121Execution:Condition Function Block Action Structured Text Actionprescan No action taken. No action taken.instruction first scan EN, TT and DN are clearedEN, TT and DN are clearedinstruction first runEnableIn is clearedEnableIn is setACC value is not modifiedEN, TT and DN are clearedACC value is not modifiedEnableOut is cleared, the instruction does nothing,and the outputs are not updated.Function Block:When EnableIn transitions from cleared to set, theinstruction initializes as described for instructionfirst scan.The instruction executes.ACC value is not modifiedEN, TT and DN are clearedACC value is not modifiednaEnableIn is always set.The instruction executes.resetEnableOut is set.When the Reset input parameter is set, theinstruction clears EN, TT and DN and setsACC = zero.postscan No action taken. No action taken.When the Reset input parameter is set, theinstruction clears EN, TT and DN and setsACC = zero.Publication 1756-RM003I-EN-P - January 2007

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