Watlow F4T User Manual

Watlow F4T • 161 • Chapter 5 Function Reference
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 Type Function
Receivers
X Analog Value from which Y is subtracted
Y Analog Value subtracted from X
Transmitter - - - - Analog The filtered result of the calculation (X – Y) plus the offset
Function
To subtract one input from another, set Function to Differential.

Watlow F4T Specifications

General

Inputs	Thermocouple, RTD, mA, V
Outputs	Relay, SSR, mA, V
Communication	Ethernet, Modbus RTU
Data Logging	Yes
Certifications	CE, UL, cUL, RoHS
Control Modes	PID, On/Off
Power Supply	100 to 240 VAC
Operating Temperature	0 to 50°C
Enclosure Rating	IP65
Display	4.3 in. (109 mm) color touch panel LCD
Control Loops	Up to 4