Using Historical Data in PG2 graphics 800xA
first of all BarValue is not standard as far as I know in 800xA. Maybe you have installed an optional System Extension ? What's your idea to present historical data as Bar ?. Normally you want to present historical data as Trend display element. The standard Bar display element does not have any historical connection.
Only present live Data u can use to represent in bar of graphic elements where in logged or history data u can't map it in the bar graphic elements,
If you want those logged properties or history values to be stamped in bar graph create the report and use office tools to make graphical bar graph view representation in excel