In Alpana, two Query Types are possible for Wonderware Historian :

  • History Values
  • State Statistics

You can select the Query Type from the listbox at the top of the Query panel :

Historian query type

History Values

This is the classic Historian Query for showing trends.
A history of Tag values is returned.

State Statistics

This query (sometimes called “State Summary Values”) allows to calculate how much time a Tag had value.
This allows to calculate for example, how long an equipment was in each of its states, and calculate performance indicators.

Last modified: Sep 13, 2021


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