Watlow F4T User Manual

Watlow F4T • 176 • Chapter 5 Function Reference
Off
The output follows the top input. A filter and offset may be applied to the output value. The
output has the units of the signal connected to the top input link.
Signals
Direction
Label Type Function
Receiver
- - - - Analog Value used for the output
Transmitter - - - - Analog The filtered input plus the offset
Function
To filter and/or add an offset to a signal, set Function to Off.
Offset
Adjustment added to the input.
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
Sensor Backup
This function passes the first input that has no error as the output. The inputs are considered
as backups in numerical order. If input 1 has no error the output follows input 1. If input 1 has
an error and input 2 does not, the output follows input 2 and so on. Only inputs connected to
a source are considered as backups. A filter and offset may be applied to the output. The out-
put has the same units as the selected input.
Signals
Direction
Label Type Function
Receivers
1 Analog Primary input
2 Analog First backup
3 Analog Second backup
4 Analog Third backup
Transmitter - - - - Analog The first input that has no error, filtered, plus the offset
Function
To automatically switch to the next of up to three alternate inputs when a sensor fails, set
Function to Sensor Backup.
Offset
Adjustment added to the output.
Range: -99,999.000 to 99,999.000

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