Watlow F4T • 160 • Chapter 5 Function Reference
Filter
Set the amount of filtering to apply. Filtering smooths signal fluctuations. Increase the time to
increase filtering. Excessive filtering slows the function’s response.
Range: 0.0 to 60.0 seconds
Deviation Scale
When SW is off, the output equals the filtered, scaled value of input X plus DEV plus the off-
set. When SW is on, the output equals the filtered value of DEV plus the offset.
Scaling converts input X proportionally from the input scale to the output range according to
the line defined by the Scale Low, Scale High, Range Low and Range High settings as shown in
the illustration.
The definition of the scaling line is very flexible. The input scale is not limited by the Scale
Low and Scale High values and, the range of the scaling calculation is not limited to values be-
tween Range Low and Range High. Input values are converted according to the line defined by
the two points. Scale High need not be greater than Scale Low, and Range High need not be
greater than Range Low. A filter and offset may be applied to the calculated value. The out-
put has the same units as input DEV.
Deviation Scale may be used instead of Process Scale when it is desirable for the output range
to be defined relative to a value that might change frequently or automatically.
Signals
Direction
Label Type Function
Receivers
X Analog Signal to scale when SW is off
DEV Analog
Signal added to the scaled value of X when SW is off, sig-
nal used without scaling when SW is on
SW Digital
When off, the output is based on DEV plus the scaled
value of input X, when on the output is based on DEV (not
scaled)
Transmitter - - - - Analog The filtered result of the function plus the offset
Function
To adjust an input by an amount proportional to another input, set Function to Deviation
Scale.
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