Question About PI Equation Timestamp

Discussion created by cesar on Mar 25, 2014
Latest reply on Mar 25, 2014 by Daniel Takara

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 :)