ABB COM600 series Data Historian Operator's Manual page 81

1MRS756739 COM600 series, Version 5.0
Data Historian Operator's Manual
Updating non-periodic history values
Update or delete operation inserts new data points immediately before (-100ns) the start
time and immediately after (+100ns) the end time of the time span and assigns them to
the original values at those time positions, and then removes values that the time span
covers. Updating then also adds the values specified in the value boxes.
If the history table to be updated is CurrentHistory and the value to be inserted is newer
than the newest history value of that variable, then the new value goes through the current
value processing. Otherwise the values are put directly into the target table.
CurrentHistoryTrendAfterUpdating.jpg
Figure 5.7.1-4 Current history trend after updating
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