Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 607)

23 • S ETTING UP TRENDS
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The Standard chart style
A standard chart plots tag values against time, as shown in the following illustration.
The XY Plot chart style
An XY Plot chart plots the values of one or more tags against another tag.
Use the XY Plot chart to plot one (or more) tag’s values against another tag’s values
instead of plotting one tag’s values against time.
For example, you could plot the temperature of a tank against the pressure of the tank.
In the following illustration, the y-axis pen’s data is plotted as a diagonal line on the trend
chart. The x-axis legend shows the scale for the x-axis pen. The time period covered by
the chart is at the upper left.
In a standard chart,
the y-axis shows
pen values …
… and the y-axis
legend shows time
values.