Allen-Bradley LOGIX 5000 Reference Manual page 342

Chapter 3 Filter
342
Operands
Function Block
Operand Type
LDL2 tag LEAD_LAG_SEC_ORDER
LEAD_LAG_SEC_ORDER Structure
Input Parameter Data Type
EnableIn BOOL
In REAL
Initialize BOOL
WLead REAL
WLag REAL
ZetaLead REAL
ZetaLag REAL
Order REAL
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Format
Structure
Description
Enable input. If false, the instruction does not execute and outputs
are not updated.
Default is true.
The analog signal input to the instruction.
Valid = any float
Default = 0.0
Request to initialize filter control algorithm. When true, the
instruction sets Out = In.
Default is cleared.
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
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
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
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 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
Description
LDL2 structure