Logix5000 Controllers General Instructions - SLAC Confluence

114 Timer and Counter Instructions (TON, TOF, RTO, TONR, TOFR, RTOR, CTU, CTD, CTUD, RES)Timer Off Delay with Reset(TOFR)The TOFR instruction is a non-retentive timer that accumulates timewhen TimerEnable is cleared.This instruction is available in relay ladder as two separateinstructions: TOF (see page 4-100) and RES (see page 136).Operands:TOFR(TOFR_tag);Structured TextVariable Type Format DescriptionTOFR tag FBD_TIMER structure TOFR structureFunction Block OperandsOperand Type Format DescriptionTOFR tag FBD_TIMER structure TOFR structureFBD_TIMER StructureInput Parameter Data Type DescriptionEnableIn BOOL Function Block:If cleared, the instruction does not execute and outputs are not updated.If set, the instruction executes.Default is set.Structured Text:No effect. The instruction executes.TimerEnable BOOL If cleared, this enables the timer to run and accumulate time.Default is cleared.PRE DINT Timer preset value. This is the value in 1msec units that ACC must reach before timing isfinished. If invalid, the instructions sets the appropriate bit in Status and the timer doesnot execute.Valid = 0 to maximum positive integerReset BOOL Request to reset the timer. When set, the timer resets.Default is cleared.Output Parameter Data Type DescriptionEnableOut BOOL The instruction produced a valid result.ACC BOOL Accumulated time in milliseconds.EN BOOL Timer enabled output. Indicates the timer instruction is enabled.Publication 1756-RM003I-EN-P - January 2007