FAQ 008: Why can’t I report on the “Current Value” for any of my historical tags?

The “Current Value” statistical function can only be used to display the “live” value of any tag exposed through a Real-Time Data Source (e.g., directly from a PLC register or an HMI tag).  To report on the most recently logged value for a tag from a Historical Data Source, select that tag in the appropriate reporting object, specify the “Last Value” statistical function, and then specify a time period back far enough to ensure that you will return a value – e.g., Relative Time, 1 hour back.