Watlow F4T User Manual

Watlow F4T • 95 • Chapter 5 Function Reference
Name
Uniquely identify this FB using up to 20 alphanumeric characters.
Function
Select to determine if cascade control will use process or deviation scale.
Options: Process, Deviation
Range Low
Set the minimum value for the cascade set point which will correspond to the lowest outer
loop power.
Range: -99,999.000 to 99,999.000
Range High
Set the maximum value for the cascade set point which will correspond to the highest outer
loop power.
Range: -99,999.000 to 99,999.000
Control Action
Select to determine if control action will be heat, cool or both.
Options:
• Off: transmitters HT, CL and PWR are turned off.
• Cool: (also referred to as direct) as the process increase the output increases.
• Heat: (also referred to as indirect) as the process increase the output decreases.
• Both: heat and cool transmitters will be driven by the Cascade FB.
Simple Set Point (SSP) Enable
When on, the cascade function will be disabled and this FB will serve as a single loop of con-
trol.
Options:
• Off: the Cascade function is active
• On: the cascade function will be disabled and this FB will serve as a single loop of
control
Disable Active Level
Choose the signal value at the SSP receiver which causes the function block to perform simple
set point control rather than cascade control.
Options:
• High: the block performs simple set point control when the signal is on
• Low: the block performs simple set point control when the signal is off

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