Realtime Group
Using transaction groups to update specific rows in a database is an easy way to expose OPC data to systems that cannot access OPC server but can query a SQL database.
To update the first row in a database
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Create a new Standard group and drag your OPC tags into the Basic OPC/Group Items area.
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On the Action tab, select the appropriate Timer, Data source, Table name, and other various settings.
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In the Table action area of the Action tab, select update/select, and first which will continue to update the first row of the database according to the timer.
To update a specific row rather than the first row in the database, select the custom or the key/value pairs options.
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Select the group, click Enabled and do a File > Save to start it.
The transaction group will only write the values that have changed to the database thus reducing the overhead.