Watlow D4T Data Logger
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Chapter 5 Function Reference
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
Universal 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 data logger has not been calibrated.
Ambient Error
The ambient temperature is outside of the data logger's operating
range.
RTD Error
An RTD sensor error has occurred.
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 data logger has become unavailable.
Variable
Use a variable to allow a user to set and modify an analog or digital signal value that is an in-
put to another block. This block is found in the Function Block Diagram editor’s Library when
working with a data logger that offers the Variable block. The number of these blocks avail-
able to be added to the diagram is shown within the parenthesis.
Choose the type of variable with the Data Type parameter. These options for the Data Type
parameter are described in detail in the following sections:
: variable holds a user-set, analog value for use as an input to another block.
: variable holds a user-set, digital or Boolean state for use as an input to another block.
Analog
• Power
: Use this function to integrate a user-set, power level or percentage in to the
application. When the Data Type is Analog and Units is Power, the Variable function ap-
pears as shown at the left.
