Change the Mode

Changing a Mode

About this task

The Mode button allows you to specify how Historian returns the data as you analyze your tags. The default mode for all initial trends is Interpolated, 1000 samples, over the last hour.
Note:
  • Calculation options are not selectable until the Calculated Sampling Mode is chosen.
  • If you enter a number in the sample increment by a size that is greater than the default set by your System Administrator, an error message appears that says Error Warning <number> samples - No data will be returned. If you get this error message, you can clear it by selecting the X in the top right corner of the message and re-enter a number equal to or less than the default as displayed in the message.
  • You must apply a query for it to persist. For example, if you have multiple charts open and you create a query but do not apply it to that chart, and then switch to another chart, and then return to the chart for which you created the query, your query will be cleared.

Procedure

  1. Select Analysis.
  2. Select the Mode button.
    The Sampling Mode and Sampling Increment appear.
  3. From the Sampling Mode drop-down menu, select a sampling mode to specify how the data will be retrieved.
    • If you select Calculated, the Calculation and Sample Increment selections appear with drop-down menus. Select the Calculation you wish to use for this mode. Then, continue with the next step.
    • If you select Interpolated, Trend, Trend to Raw, Interpolated to Raw, Lab, or Lab to Raw, continue with the next step.
  4. From the Sample Increment drop-down menu, select the increment you want to use in this mode.
    • If you select By Time, you must enter the time value and define the unit of time you want to use in this mode.
    • If you select By Size, you must enter the number of samples. The maximum number is defined by your System Administrator.
  5. When you are satisfied with your changes, select the Apply (or Apply to All) button to activate them.