Data Group
The following describes the historical data group settings specific to the PLX51 History Values connector.
Group Types
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For PLX51 History Values 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 numeric value logged to the database between the start and end time specified.
By default, the Output Options on the Columns tab of the Data Group settings is set to Timestamp on First Column which does not display millisecond-resolution timestamps. Millisecond timestamps are enabled with Timestamp, Millisecond on first column.
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
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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 the PLX51 Data Logger only Raw Values are available.
Lead Times
The amount of time (in seconds) to retrieve data before the start time.