Example: XY plot

A trend chart can plot values against time, or against a selected pen. In an XY plot, the x-axis represents the value of a selected pen.
The time span controls the number of points shown. For example, if the time span is 20 seconds, and the interval is 1 second, the chart shows up to 20 points. Data points outside the time span are removed from the display. The time span is included in the chart title.
In the chart below, the x-axis pen is read from the N7:21 address in a PLC. The green pen represents values read from N7:22. The chart shows:
  • The last value was read at 3:48:07 (represented by the time span in the chart title).
  • At that time, the value in N7:21 was almost 80.
  • The value in N7:22 was between 25 and 50.
tx_XY_plot
Set up the chart style on the
General
tab in the Trend
Properties
dialog box.
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