342 Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Operands
Function Block
Operand Type Format Description
LDL2 tag LEAD_LAG_SEC_ORDER Structure LDL2 structure
LEAD_LAG_SEC_ORDER Structure
Input Parameter Data Type Description
EnableIn BOOL Enable input. If false, the instruction does not execute and outputs
are not updated.
Default is true.
In REAL The analog signal input to the instruction.
Valid = any float
Default = 0.0
Initialize BOOL Request to initialize filter control algorithm. When true, the
instruction sets Out = In.
Default is cleared.
WLead REAL The lead corner frequency in radians/second. If WLead < minimum
or WLead > maximum, the instruction sets the appropriate bit to
true in Status and limits WLead. If the WLag:WLead ratio >
maximum ratio, the instruction sets the appropriate bit in Status to
true and limits WLag
Valid = see Description section below for valid ranges.
Default = 0.0
WLag REAL The lag corner frequency in radians/second. If WLag < minimum or
WLag > maximum, the instruction sets the appropriate bit to true in
Status and limits WLag. If the WLag:WLead ratio > maximum ratio,
the instruction sets the appropriate bit to true in Status and limits
WLag.
Valid = see Description section below for valid ranges
Default = 0.0
ZetaLead REAL Second order lead damping factor. Only used when Order = 2. If
ZetaLead < minimum or ZetaLead > maximum, the instruction sets
the appropriate bit to true in Status and limits ZetaLead.
Valid = 0.0 to 4.0
Default = 0.0
ZetaLag REAL Second order lag-damping factor. Only used when Order = 2. If
ZetaLag < minimum or ZetaLag > maximum, the instruction sets
the appropriate bit to true in Status and limits ZetaLag.
Valid = 0.05 to 4.0
Default = 0.05
Order REAL Order of the filter. Selects the first or second order filter algorithm. If
invalid, the instruction sets the appropriate bit to true in Status and
uses Order = 2.
Valid = 1 to 2
Default = 2
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