Watlow F4T User Manual

Watlow F4T • 197 • Chapter 5 Function Reference
Filter
Set the amount of filtering to apply. Filtering smooths signal fluctuations. Increase the time to
increase filtering. Excessive filtering slows the input’s response.
Range: 0.0 to 60.0 seconds
Input Error Latching
Set whether an input error persists until it is cleared or clears automatically when the sensor
signal returns to a normal level.
Options:
• Off: error clears automatically once the input returns to normal.
• On: error remains active until the input returns to normal and the error is cleared by
the Clear Error parameter.
Clear Error
Set this parameter to Clear to reset the input error after correcting the condition that caused
it.
Options: Ignore, Clear
Thermistor Input Errors
Error Status Description
None No error is detected.
Open A sensor is broken or disconnected.
Shorted A sensor has failed or is shorted.
Measurement Error A measurement error has occurred.
Bad Calibration The controller has not been calibrated.
Ambient Error
The ambient temperature is outside of the controller's operating
range.
Fail A measurement failure has occurred.
Not Sourced An input signal is not connected to a function block's output.
Stale Data Data sourced from another controller has become unavailable.
Math Error A calculation has no defined result (such as divide by zero).
Timer
Use a timer when applications require timed control of outputs or a delay to an output for
a specific length of time. This block is found in the Function Block Diagram editor’s Library
when working with a controller that offers the Timer block.
The number of these blocks available to be added to the diagram is shown within the paren-
thesis.
Choose the type of timer with the Function parameter. These options for the Function param-
eter are described in detail in the following sections:
Off: disables the timer and holds the output is in its inactive state.
On Pulse: sets the output for a specified time.
Delay: switches the output a specified time after the input changes states.
One Shot: triggers the output by setting the time, timer counts down while the input is ac-
tive, output is active until time runs out.

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