Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 613)

23 • S ETTING UP TRENDS
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The trend in the following illustration uses shading to indicate tag values in alarm. The
difference between the tag’s value and the tag’s alarm level is shaded.
Example 1: Shading with three pens
The upper pen, Pen 2, has a constant value of 75 and the lower pen, Pen 3, has a constant
value of 25.
Pen 1 represents the tag called VIN_LEVEL. The trend is shaded whenever Pen 1 goes
above Pen 2 or below Pen 3. A plot for this trend looks like this:
Shading between pen
values
Upper-bound pen
Lower-bound pen
Pen 1
Pen 2
Pen 3