332 Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Output Parameter Data Type Description
EnableOut BOOL Indicates if instruction is enabled Cleared to
false if Out overflows.
Out REAL The calculated output of the algorithm.
DeltaT REAL Elapsed time between updates. This is the
elapsed time in seconds used by the control
algorithm to calculate the process output.
Status DINT Status of the function block.
InstructFault (Status.0) BOOL The instruction detected one of the following
execution errors. This is not a minor or major
controller error. Check the remaining status bits
to determine what occurred.
WLagInv (Status.1) BOOL WLag < minimum value or WLag > maximum
value.
OrderInv (Status.2) BOOL Invalid Order value.
TimingModeInv (Status.27) BOOL Invalid TimingMode value.
RTSMissed (Status.28) BOOL Only used in real time sampling mode. Set to
true when
ABS(DeltaT – RTSTime) > 1 millisecond.
RTSTimeInv (Status.29) BOOL Invalid RTSTime value.
RTSTimeStampInv (Status.30) BOOL Invalid RTSTimeStamp value.
DeltaTInv (Status.31) BOOL Invalid DeltaT value.
Structured Text
Operand Type Format Description
LPF tag FILTER_LOW_PASS structure LPF structure
See Structured Text Syntax for more information on the syntax of expressions
within structured text.
Description
The LPF instruction uses the Order parameter to control the sharpness of the
cutoff. The LPF instruction is designed to execute in a task where the scan rate
remains constant.
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