Differential - Watlow F4T User Manual

Scale Low
Set the value of input X at which the Low Range setting plus the DEV value is the desired out-
put. Scale Low and Range Low are the coordinates of a point on the line that relates input X
to the adjustment added to input DEV to calculate the output.
Range: -99,999.000 to 99,999.000
Scale High
Set the value of input X at which the High Range setting plus the DEV value is the desired
output. Scale High and Range High are the coordinates of a point on the line that relates input
X to the adjustment added to input DEV to calculate the output.
Range: -99,999.000 to 99,999.000
Range Low
Set the adjustment be added to input DEV when input X equals the Scale Low setting. Scale
Low and Range Low are the coordinates of a point on the line that relates input X to the ad-
justment added to input DEV to calculate the output.
Range: -99,999.000 to 99,999.000
Range High
Set the adjustment to be added to input DEV when input X equals the Scale High setting.
Scale High and Range High are the coordinates of a point on the line that relates input X to
the adjustment added to input DEV to calculate the output.
Range: -99,999.000 to 99,999.000
Offset
Adjustment added to the result of the calculation.
Range: -99,999.000 to 99,999.000
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

Differential

This function calculates input X minus input Y. A filter and offset may be applied to the calcu-
lated value. The output has the units of input X.
Signals
Direction Label
X
Receivers
Y
Transmitter - - - - Analog
Function
To subtract one input from another, set Function to Differential.
Wat l ow F4T
Type
Analog Value from which Y is subtracted
Analog Value subtracted from X
The filtered result of the calculation (X – Y) plus the offset
Function
• 1 6 1 • Ch ap t er 5 Fu n ct io n Re f e r e n c e