ABB COM600 series Data Historian Operator's Manual page 71

1MRS756739 COM600 series, Version 5.0
Data Historian Operator's Manual
Field Description
Common limit The common upper scaling limit is the highest upper limit, while the
common lower scaling limit is the smallest lower limit.
Common limits are only displayed if they are used in one of the graphs
and if no individual limits have been defined for the plot.
The common limit values can be changed by entering a new value in
the box.
Individual The individual upper and lower scaling limit of the curve.
Individual limits are marked in the boxes with a small triangle, the color
of which is the same as that of the graph.
To change the individual limit value, enter a new value in the box.
Automatic limit Automatically calculated individual upper and lower scaling limits of the
plot.
If automatic scaling is used for the variable, the variable's limits are
calculated automatically and cannot be changed.
The background color of the box for automatic limit is gray.
If several graphs are added to the same chart, the scale limits are displayed on both sides
of the chart. The first is depicted on the left, the second on the right, the third on the left
again, and so on. The following figure shows a chart with three graphs, each using indi-
vidual and automatically set scaling limits.
Also common limits can be automatically calculated. When
they are automatically calculated, the background color is
gray and the values are defined with the help of the minimum
and maximum values of the graphs.
For uptime variables automatic and individual limits need to
be used in order to get the correct time format visible in the
limit indicators.
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