Rockwell Automation Publication 1756-RM006K-EN-P - November 2018 345
WLead:WLag ratio If WLead > WLag, no limitations
If WLag > WLead:
• No minimum limitation for WLag:WLead
• First order maximum for WLag:WLead = 40:1 and the
instruction limits WLag to enforce this ratio
• Second order maximum for WLag:WLead = 10:1 and the
instruction limits WLag to enforce this ratio
ZetaLead second order only LowLimit = 0.0
HighLimit = 4.0
ZetaLag second order only LowLimit = 0.05
HighLimit = 4.0
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
No
Major/Minor Faults
None specific to this instruction. See Common Attributes for operand-related
faults.
Execution
Function Block
Condition/State Action Taken
Prescan EnableIn and EnableOut bits are cleared to false.
Tag.EnableIn is false EnableIn and EnableOut bits are cleared to false.
Tag.EnableIn is true EnableIn and EnableOut bits are set to true.
The instruction executes.
Instruction first run N/A
Instruction first scan Recalculate coefficients.
Postscan EnableIn and EnableOut bits are cleared to false.
Structured Text
Condition/State Action Taken
Prescan See Prescan in the Function Block table.
Normal Execution See Tag.EnableIn is true in the Function Block table.
Postscan See Postscan in the Function Block table.
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