ABB COM600 series Data Historian Operator's Manual page 82

Figure 5.7.1-5 Current history trend after deletion
82
COM600 series, Version 5.0
Data Historian Operator's Manual
The effect of the history update is seen as a straight line from the start value to the end
value and as the additional value points just before and after the selected time span.
The effect of history value deletion is seen as an empty region from the left additional
value to the right additional value. The highlighted area remains selected and you can
update the values of another variable on the same time span. To do so, continue by
selecting the desired variable from the legend.
In addition to the time span based updating there are two more ways to update history
values:
• Inserting, replacing or deleting a single data value of a history table. These are ini-
tialized with a single click on a chart. The system responds by showing a vertical
line on top of the chart. The time and the corresponding default value are shown on
the time bar.
• Replacing or deleting a single data point of a history table. To initialize these options,
set the cursor on a chart so, that the tool tip of the value to be updated becomes
visible. Then hold down the Shift-key and click. The system responds by highlighting
the range, which begins from the shown data value and ends just before the next
data point of the variable or at the right end of the chart. The default value and the
1MRS756739
CurrentHistoryTrendAfterDeletion.jpg