Tag logging

During run time, WindowViewer can write an entry to the historical log file each time a tag’s value changes more than the specified log deadband. WindowViewer also writes entries to the log at a fixed interval regardless of current tag values. By default, this fixed interval is one hour.

Note: For more controllable and versatile logging, consider using Historian to store InTouch historical data.

The Tagname Dictionary dialog box includes separate options to log data and events to the log file. You can set value logging options. For information about setting event logging, see Configure alarms.

For a tag's value to be written to the historical log file, historical logging must be enabled. For more information about setting general logging properties, see Configure historical logging.

For integer and real tags, you can set the Log Deadband in their respective details dialog boxes. The Log Deadband option specifies how many engineering units a tag's value must change to write a log entry.

Configure logging for a tag

1. Open the Tagname Dictionary.

2. Select the tag whose data you want saved to the log file.

3. Select Log Data.

   

4. Select Log Events if you want to log value changes to the tag initiated by an operator, an I/O, QuickScript, or operating system. The Priority box appears after you select Log Events.

   

   The Priority value determines the event priority for the tag. Valid values are 1 to 999, where 1 is the highest priority and 999 is the lowest.

5. Select Save and then close the Tagname Dictionary.