Choose a Mode

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 clicking 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.