Rockwell-automation Migrating PanelView Enhanced Terminal Applications User Manual Page 128

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128 Publication 2711P-QS001A-EN-P - October 2007
Chapter 9 Measure and Improve Runtime Application Performance
Data Log Model
The Data Log Model editor lets you configure up to 100 analog or
digital tags that are logged to a file.
On the Log Triggers tab, you can define these tags to receive Periodic
or On Change tag updates.
For the Periodic configuration, you define a logging interval in
which the tags are periodically updated.
For the On Change configuration, you define the maximum
update rate for updating the tags.
The On Change configuration also lets you define a Change
Percentage and Heartbeat setting.
Change Percentage: Logs tag values once a value has changed
by a certain percentage. The percentage is based on the tag's
minimum and maximum values as configured in the tag editor.
Only tags that change by the specified percentage are logged.
Heartbeat: Specifies a time interval on how often tag values are
logged even if no change has occurred. The heartbeat verifies
that the data in the log file is current.
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