Rockwell Automation Migrating PanelView Enhanced Terminal Applications - Manual (Page 128)

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.