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Data Group

The following describes the historical data group settings specific to the WinCC Advanced Historical Values connector.

Group Types

The following group types are available:

Summary Values from XLReporter

This group type retrieves sampled values from the database and performs calculations on those samples for reporting.

By default, summary values are calculated time weighted, and values are propagated based on the last known value. However, to change this so that summary values are calculated strictly on the data returned check use raw values.

Raw Values

This group retrieves every value logged to the database between the start and end time specified.

Custom Values

This option opens the Database Group builder where a query can be configured to retrieve data from any table in the database.

Group Settings

Setup Tab

Retrieval (Summary Values for XLReporter Group)

The Retrieval settings define how data is retrieved for the calculations selected for the group. The following settings are available:

  • Retrieval Mode

  • This setting defines how data is retrieved from the historian. For WinCC Advanced, only Raw Values are available.

  • Lead Time

  • The amount of time (in seconds) to retrieve data before the start time.

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