Watlow F4T

Watlow F4T • 168 • Chapter 5 Function Reference
Math Errors
Inputs that are not connected are ignored. Otherwise error behavior is specific to the Func-
tion setting.
Function Error Condition Result
Off Any or none
The output value and error follow the first
input
Average
One or more, but not all inputs
have errors
The output value is the average of the in-
puts that have no errors and the output has
no error.
All inputs have errors
The output has the last good value and has
an error.
Switch
Over
When SW has no error
The output’s value and error follow the in-
put selected by the digital input.
When SW has an error The output value and error follow input 1.
Deviation
Scale
X or DEV or both have errors
The output is equal to the offset and has an
error.
SW has an error The function considers the switch to be off.
Process
Scale
X has an error
The output is equal to the offset and has an
error.
SW has an error The function considers the switch to be off.
Differen-
tial
X or Y or both have errors
The output is equal to the offset and has an
error.
Ratio
X or Y or both have errors
The output is equal to the offset and has an
error.
Y equals zero
The output is equal to the offset and has an
error.
Add Any or all inputs have errors
The output is equal to the offset and has an
error.
Multiply Any or all inputs have errors
The output is equal to the offset and has an
error.
Absolute
Difference
X or Y or both have errors
The output is equal to the offset and has an
error.
Maximum
One or more, but not all inputs
have errors
The output value is the maximum of the
inputs with no errors and the output has no
error.
All inputs have errors
The output’s value and error follow the first
input.
Minimum
One or more, but not all inputs
have errors
The output value is the minimum of the in-
puts with no errors and the output has no
error.
All inputs have errors
The output’s value and error follow the first
input.