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CHAPTER 11 – Data Logging
Add Field Link Dialog
The Add Field Link dialog show below is show when the 'Add Field Link...' menu option is selected
from the Data Log editor, and the identical Modify Field Link dialog when the 'Edit' menu is
selected.
Name
For convenience, a unique Field Link name is created automatically. This can be changed to give a
more meaningful description, if required.
Field Link
Select the Field to link to from the list showing fields configured in the chosen Recordset.
Expression
Enter the point name or expression that will be logged. The Browse button allows easy point
selection.
Data Type
Set the type of the data to be stored. For a point, this is automatically set to the same as the point type
when selected using the Browse button. However, for an expression this must be specified, for
example, an expression $Second / 3 will create a Real value, but the required data may be just the
integer part, so the Data Type would be set to Integer.
Deadband
This allows the value of the expression to change within the percentage limit without being logged.
This is particularly useful when logging analogue values that are subject to noise. Each sample is
checked (when the value changes for 'On Change' sampling, or every log period for 'On Interval')
against the last logged value. While the value varies within the deadband, the values are ignored.
When the value exceeds the deadband limits the new value will be logged. This may dramatically
reduce file size, and ease analysis.
Page 190
OMRON
Release 2.0
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