Watlow F4T User Manual

Watlow F4T • 180 • Chapter 5 Function Reference
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.
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
Ratio
This function calculates the quotient, input X divided by input Y. A filter and offset may be
applied to the calculated value. If both inputs have the same units, the output has no units,
otherwise the output has the units of input X.
Signals
Direction
Label Type Function
Receivers
X Analog Value divided by Y (numerator)
Y Analog Value by which X is divided (denominator)
Transmitter - - - - Analog The filtered result of the calculation (X ÷ Y) plus the offset
Function
To divide one input by another, set Function to Ratio.
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

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