Rockwell Automation FactoryTalk View Machine Edition Users Guide - Manual (Page 546)

F ACTORY T ALK V IEW M ACHINE E DITION U SER ’ S G UIDE
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Isolated graphing
For charts with multiple pens, you can allow the pen values to overlap, or you can isolate
each pen in its own horizontal band on the chart.
This is an example of isolated graphing, with a 10% buffer between each pen’s band:
Notice that in this illustration each pen uses its own scale. If desired, you can use the same
scale for all pens.
With isolated graphing, a grid line is automatically placed above each pen’s band.
Plot a value across the full width of the chart
Use horizontal lines to provide a frame of reference for your tag data. For example, if you
define values that are the limits within which a tag must operate, and show horizontal
lines in your trend to indicate the limits, when a tag crosses one of these limits the tag’s
alarm condition is obvious on the trend.
There are two ways to plot a value across the full width of the chart:
 In the Connections tab, assign a constant value to a pen.