We monitor equipment in a PI tag, we only need to know when the state has changed over a period of time. Can I retrieve this type of data in Datalink?
OK, I got an answer from Tech Support - those folks are awesome -
You can do this using a PE as follows:
|IF 'tagname' <> PrevVal('tagname','*') THEN 1 ELSE 0|
This returns only the timestamps when the device state changed.