Watlow F4T • 192 • Chapter 5 Function Reference
Dead Band
Set the minimum amount for a single adjustment to the valve position. This is set as percent-
age of the full range of motion (closed to open). Small values allow finer adjustments, but can
wear the valve more quickly. Large values reduce the frequency of adjustments and so reduce
wear on the mechanism, but also reduce the accuracy.
Range: 1.0 to 100.0%
Temperature Input
Configure and use this input to condition a temperature measurement made with a thermo-
couple or RTD. The Temperature Input block scales the signal to an absolute temperature with
no other configuration required.
Resistance Temperature Device (RTD) 100 and 1000 Ohm
Use this block to condition a temperature measurement made with an RTD. This FB is found
on the canvas of the FB diagram. The number of these FBs that are available depends on the
number of installed flex modules with temperature inputs.
The module number shown on the block is the number of the controller’s slot that houses the
flex module with the temperature input. The Temperature In number indicates the specific in-
put on the flex module.
Signals
Direction Label Type Function
Transmitter - - - - Analog The measured temperature with filter and offset applied
Name
Uniquely identify this FB using up to 20 alphanumeric characters.
Sensor Type
Select the device used to measure temperature.
Options: RTD 100 Ohm, RTD 1000 Ohm
Display Precision
Set how many decimal places are displayed for the process value and associated parameters
such as set points.
Options: Whole, Tenths, Hundredths, Thousandths
Calibration Offset
Set a value to add to the measured input value to compensate for sensor placement, lead
wire resistance or other factors that cause the input to
vary from the actual process value
Range: -99,999.000 to 99,999.000°F or units
-55,555.000 to 55,555.000°C
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