Watlow F4T User Manual

Watlow F4T • 186 • Chapter 5 Function Reference
Process Errors (cont.)
Function Error Condition Result
Switch Over
When SW has no error
The output’s value and error follow the
input selected by the digital input.
When SW has an error
The output value and error follow input
1.
Differential X or Y or both have errors
The output is equal to the offset and
has an error.
Ratio
X or Y or both have errors
The output is equal to the offset and
has an error.
Y equals zero
The output is equal to the offset and
has an error.
Add Any or all inputs have errors
The output is equal to the offset and
has an error.
Multiply Any or all inputs have errors
The output is equal to the offset and
has an error.
Absolute Dif-
ference
X or Y or both have errors
The output is equal to the offset and
has an error.
Maximum
One or more, but not all inputs
have errors
The output value is the maximum of
the inputs with no errors and the out-
put has no error.
All inputs have errors
The output’s value and error follow the
first input.
Minimum
One or more, but not all inputs
have errors
The output value is the minimum of the
inputs with no errors and the output
has no error.
All inputs have errors
The output’s value and error follow the
first input.
Square Root
X has an error
The output is equal to the offset and
has an error.
X is less than zero
The output is equal to the offset and
has an error.
Viasala %RH or T or both have errors %RH has an error
Pressure to
Altitude
X has an error
The output’s value is calculated as usu-
al and has an error.

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