I am trying to create a live chart of two values Torque vs Angle.
Those values are coming from two seperate tags, logged with historian.
I have a chart component graphing the two of their values but it doesn’t really work because the way the tags are logged with historian, only one of the two values can change at a time.
I need a way to log both of their new values at the same time with historian. Is there a way I can do that?
That would be the SQL Bridge module’s Transaction Group functionality. The Tag Historian doesn’t maintain timing relationships between different tags. A transaction group can sample multiple tags/OPC items and will save them together in a table row with a common timestamp.
Yea, I tried using historian because I need to capture at a faster rate because the chart with transaction group wasn’t fast enough
How fast did you tell the transaction group to evaluate its trigger? Transaction groups can generally go as fast as your DB is capable. (Are you actually able to sample the changing values fast enough? What sample rate do you need?)