Change how often a trend chart requests data from controllers

Change how often a
Trend chart
 graphic element requests data from a controllers by changing its sample rate. The default sample rate is every 1000 milliseconds or every second. Change the sample rate to match the interval to sample data for the trend chart. For example, change the sample rate to match the rate at which data updates in the controllers.
To change how often a trend chart requests data from controllers
  1. Select the trend chart on the screen.
  2. In the
    Properties
    window, select the
    Properties
    tab.
  3. Expand the
    General
    category.
  4. In the
    SampleRate
    box, enter the rate, in milliseconds, at which the trend chart requests data from the controllers. Enter positive numbers between 500 and 60000 to represent one-half second to 60 seconds.
    TIP:
    Tips:
    • If the trend chart requests data more frequently than data updates in the controllers, the data plotted may not appear in a linear fashion on the trend chart.
    • To avoid slow panning on a trend chart that has a time span over 30 minutes, enter a minimum of 1000 milliseconds, or one second.
    • Trend charts automatically display data from a data log for the specified tag. Tags may exist in more than one data log. The trend chart uses the data log that contains a matching sample rate. If there is more than one data log with a matching sample rate or there is no data log with a matching sample rate, the trend chart uses the first data log.
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