Use the fields within the Background Logging section of a string point’s ODBC tab to specify whether Geo SCADA Expert is to regularly update the string’s value in the Geo SCADA Expert database, regardless of whether that value has changed.
- Enabled—Clear this check box if Geo SCADA Expert is only to update the string’s value in the Geo SCADA Expert database whenever that value changes. The other fields in the Background Logging section are ‘grayed out’ and unavailable for use.
Select the Enabled check box if Geo SCADA Expert is to regularly update the string’s value, regardless of whether that value has changed. This provides confidence that Geo SCADA Expert is continuing to retrieve the string’s data from the other application’s database. When this check box is selected, users can monitor the string’s Last Updated status attribute to ascertain when Geo SCADA Expert last updated the point’s value. Use the rest of the fields within the Background Logging section to specify how often Geo SCADA Expert updates the point’s data when that value is not changing. (With a string point for which the value is changing, Geo SCADA Expert scans the other application’s database and updates the string’s value in the Geo SCADA Expert database at the Scan Rate specified on the ODBC Query Form (see Configure the Query Properties).)
- Interval—Use to specify the frequency with which Geo SCADA Expert updates the point’s value, regardless of whether that value has changed.
Enter the required Interval in the OPC Time Format, for example 15M for Geo SCADA Expert to update the point’s value at 15-minute intervals.
- Offset—Use to specify the Background Logging start time—the amount of time that occurs before Geo SCADA Expert first updates the point’s value, regardless of whether that value has changed. You need to define the time value and time unit from which the start time is to be offset from the present time. Specify the Offset in the OPC Relative Time Format. For example, specify H for Geo SCADA Expert to start updating the point’s value at the start of the present hour, and thereafter at the intervals specified in the Interval field, above.
NOTE: Background Logging is used to apply additional functionality to ODBC analog and digital points—see Configure the Background Logging Properties of Analog and Digital Points.