Rockwell Automation Publication 1756-RM006K-EN-P - November 2018 333
The LPF instruction uses these equations:
When: The instruction uses this Laplace transfer function:
Order = 1
Order = 2
Order = 3
with these parameters limits (where DeltaT is in seconds):
Parameter Limitations
WLag first order
LowLimit
WLag second order
LowLimit
WLag third order
LowLimit
HighLimit
Whenever the value computed for the output is invalid, NAN, or INF, the
instruction sets Out = the invalid value. When the value computed for the output
becomes valid, the instruction initializes the internal parameters and sets Out =
In.
Affects Math Status Flags
Controllers Affects Math Status Flags
ControlLogix 5580 No
CompactLogix 5370, ControlLogix
5570
Yes for the output
Major/Minor Faults
None specific to this instruction. See Common Attributes for operand-related
faults.
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