Watlow F4T User Manual

Watlow F4T • 108 • Chapter 5 Function Reference
Not Equal To: the block’s output is on when the two inputs are not equal to each other
Greater or Equal: the block’s output is on when input A is greater than or equal input B
Less or Equal: the block’s output is on when input A is less than or equal to input B
Off
When the Compare block’s function is set to Off, the output (T/F) is off.
Greater Than
The output (T/F) is on when receiver A is greater than B.
Signals
Direction Label Type Function
Receivers
A Analog Signal to be compared to B
B Analog Signal to be compared to A
Transmitter T/F Digital On when A is greater than B, otherwise off
Function
To test if A is greater than B, set Function to Greater Than.
Error Handling
When an error exists on any receiver, the function cannot definitively determine the result of
the comparison and an error will be generated. Use Error Handling to select the output's val-
ue.
Options:
• True Good: output true (on) and no output error
• True Bad: output true (on) and output error
• False Good: output false (off) and no output error
• False Bad: output false (off) and output error
Less Than
The output (T/F) is on when receiver A is less than B.
Signals
Direction Label Type Function
Receiver
A Analog Signal to be compared to B
B Analog Signal to be compared to A
Transmitter T/F Digital On when A is less than B, otherwise off
Function
To test if A is less than B, set Function to Less Than.
Error Handling

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