SLEW
Tracks the process variable with the output. The absolute rate of
change per second of OUT is limited to the maximum RATE.
Parameter values for the SLEW function block:
Parameter | Data Type | Description |
|---|---|---|
PV | REAL | Input process variable having a REAL value. |
RATE | REAL | Absolute rate of change per second. This input must have a positive REAL
value. |
OUT | REAL | On initialization OUT sets to PV. |
When an overflow or underflow condition occurs during the execution of the function
block, OUT sets to PV and the corresponding
ERRSTAT
Overflow or Underflow error
counter increments.When RATE is negative, the
ERRSTAT
Param error counter
increments and RATE uses 0 as a value.Function Block Diagram
Example
Structured Text Example
OutValue
:= (Process1, Rate_pv);
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