History Updating And Recollection; Updating Values Of A Variable In A History Table - ABB COM600 series Data Historian Operator's Manual

5.7.
5.7.1.
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COM600 series, Version 5.0
Data Historian Operator's Manual
• Select the desired option by clicking its row.
If the selected numerical value does not match exactly with
the selected unit, the numerical value is rounded to a matching
value closest to the original.

History updating and recollection

Values in the history tables can be updated e.g. to correct possible errors or to insert
missing values. To correct history data, you can update the values in history tables and
activate so called recollection to compute the calculated variables and transformations.
This propagates the changes to all affected history tables. You update the values of a
variable in a history table for either a selected time span, single value or a single point
in a chart window, that displays the variable values from the history table.
The updating functions are:
• adding new values
• replacing existing values
• deleting existing values
From history updating point of view, there are two kinds of history tables: periodic and
nonperiodic. After you have updated the values of all variables you want to correct, you
can activate recollection for all variables in the history table for this time span. This can
be done in any chart window. Depending on the recollection definitions in the RTDB,
the recollection may be cumulated for all higher-level history tables.

Updating values of a variable in a history table

•
Open a chart window that presents values of the variable you want to update (in the
example charts, the data points are marked for clarity).
• Click the variable in the legend to select it, and then select the time span you want
to update. After the selections, the system shows the start and end values of the
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