Logix5000 Controllers General Instructions - SLAC Confluence

654 Function Block AttributesOverview of timing modesThe following diagram shows how an instruction determines theappropriate timing mode.Determine time base modeTimingMode = 0TimingMode = 1TimingMode = 2Periodic timingOversample timingReal time timingDeltaT = OversampleDTDeltaT = RTSTimeStamp n - RTSTimeStamp n-1Determine task typeIf DeltaT < 0 or DeltaT > 4194.303 secs.the instruction sets DeltaT = 0.0 and setsthe appropriate bit in Status.If DeltaT > 0, the instruction executes.Periodic taskEvent or Continuous taskDeltaT = task scan timeDeltaT = elapsed time since last executionPublication 1756-RM003I-EN-P - January 2007