Logix5000 Controllers General Instructions - SLAC Confluence

652 Function Block AttributesCommon instruction parameters for timing modesThe instructions that support time base modes have these input andoutput parameters:Input parametersInput Parameter Data Type DescriptionTimingMode DINT Selects timing execution mode.Value:Description:0 periodic mode1 oversample mode2 real time sampling modevalid = 0 to 2default = 0When TimingMode = 0 and task is periodic, periodic timing is enabled and DeltaT is set tothe task scan rate. When TimingMode = 0 and task is event or continuous, periodic timing isenabled and DeltaT is set equal to the elapsed time span since the last time the instructionwas executed.When TimingMode = 1, oversample timing is enabled and DeltaT is set to the value of theOversampleDT parameter.When TimingMode = 2, real time sampling timing is enabled and DeltaT is the differencebetween the current and previous time stamp values read from the module associated withthe input.If TimingMode invalid, the instruction sets the appropriate bit in Status.OversampleDT REAL Execution time for oversample timing. The value used for DeltaT is in seconds. IfTimingMode = 1, then OversampleDT = 0.0 disables the execution of the control algorithm. Ifinvalid, the instruction sets DeltaT = 0.0 and sets the appropriate bit in Status.valid = 0 to 4194.303 secondsdefault = 0.0Publication 1756-RM003I-EN-P - January 2007