History Update Log; Activating Recollection Of All Variables In A History Table - ABB COM600 series Data Historian Operator's Manual

5.7.3.
Figure 5.7.3-1 History Update Log table
5.7.4.
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COM600 series, Version 5.0
Data Historian Operator's Manual

History Update Log

Each update and deletion or scenario operation generates a new row to the History
Update Log table. A row contains information about the target table and variable,
updating time, time span and corresponding values, and what was the updating operation.

Activating recollection of all variables in a history table

Recollection (includes recalculation) is performed for all variables for a selected time
span. Recollection requires that recalculation and recollection definitions have been
specified in RTDB. They define which history tables are recollected. When the recollec-
tion is activated, you specify the history table and a time stamp indication where data
has been updated. The recollection will then compute all variables and upper level history
tables that depend on the defined source table. For example, when some source values
in one hour average level have been modified, the one hour level recalculation will cal-
culate the variables that depend on the source variables. After that, the one day average
values are recollected from the one hour level values, and so on.
• Open a chart window that shows the time axis and the time span bar.
•
Change the time span of the window so, that it covers the time span that will be
recollected, if necessary.
• Select the part of the time span, that will be recollected
•
Right-click in the graph area to open the Graph Area pop-up menu:
Figure 5.7.4-1 The Graph Area pop-up menu
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HistoryUpdateLogRow.jpg
RecalculationActivation.jpg