Hi Community,
If I have a tag which updates every 2 hours and want to know its yesterday's value. The equation tagvalue('tag1','*-1d') won't do because the data updates only once in 2 hours and its calculation will be based on the PI system clock (since * indicates now) and not on tag's timestamp. For example, the latest data is 25Mar2014 18:00, the timestamp of my equation should be 24Mar2014 18:00.
Any help will be appreciated!
TIA 