Configure the time span of a historical trend

You can configure the time span of a historical trend.

Configure the time span of a historical trend

1. Double-click on the trend object to show the Historical Trend Configuration dialog box.

2. In the Chart Time area, type the length of time in Initial Time Span that you want to appear on the horizontal x-axis of the trend.

3. Select the time unit of measure: Seconds (Secs), Minutes (Mins), Hours (Hrs), or Days (Days).

   For example, it you enter 8 in Initial Time Span and then select Hrs, the time span shown on the trend is 8 hours.

4. In the Initial Display Mode area, select the type of historical trend that appears when WindowViewer initially shows the window containing the trend.

   Initial Display Mode	Description
   Min/Max	The chart shows changes in the percentage of engineering units scale as a vertical line over the time span.
   Average	Each pixel within a trend time segment shows the average value of a tag over the period of time within the segment.

5. Go to Configure historical trend display options to configure the visual appearance of a historical trend.