ABB COM600 series Data Historian Operator's Manual page 70

70
COM600 series, Version 5.0
Data Historian Operator's Manual
The graphs in the chart window can have either common or individual limits. For
explanations, see Table 5.3-1.
Individual and common scaling limits can be changed by using boxes or at the ends of
the scales.
The upper limits are located at the top and the lower limits at the bottom of the scale
area. The values of variable items are scaled so that the value corresponding to the upper
limit is drawn at the top of the plot area and the value corresponding to the lower limit
is at the bottom of the area. If the curve exceeds the upper limit or falls below the lower
limit at some intervals, the graph is not drawn on these intervals.
If scaling is depicted using scales, the common limits are displayed on a black scale.
The scale for graphs with individual limits is shown in the same color as the graph.
Limit scales
Figure 5.3-1 Limit scales
The following table lists the limit scales.
Table 5.3-1 Limit scales
Field Description
Upper limits The upper scaling limits are located at the top.
Lower limits The lower scaling limits at the bottom.
Limit presentation option
= upper and lower limits enabled
= scale enabled
1MRS756739
Limits.jpg