Trend objects

Trend objects are wizards that chart the values of tags over time.

There are three main types of trend objects:

• Real-time trends chart up to four tags in real time.

• Historical trends chart up to eight tags over a past time period.

• 16 Pen trends chart real-time and historical data for up to sixteen tags.

There is no limit to the number of trend objects, real-time or historical, you can place in a window.

Configure trend objects with the following items:

• Time span

• Value range

• Grid resolution

• Location of time and value stamps

• Pens and colors

Before you can use a trend wizard, you must enable logging for each tag to track, and also enable logging within the InTouch application.

Enable logging for tags

1. From the Tagname Dictionary, select a tag and then select Log Data.

2. If you have not done so previously, enable logging in the InTouch application.

   1. Open WindowMaker.

   2. On the File menu, point to Configure, and then select Historical Logging.

      The Historical Logging screen appears.

   3. Select the Enable Historical Logging checkbox or Enable Storage to Historian checkbox and select OK.

For more information on configuring and using trend objects, see Trending tag data.