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Can I use a Trend Graph to display historical trend data?
Tags: Data Trend Objects FAQ
The Trend Graph in EBPro can be set to show real-time (default) trends, or historical trend data.

If set for historical trending, a History Control Register must be configured. This is the register that controls the data shown on the trend graph. A value of 0 in the History Control register will show today’s data in the trending graph. A value of 1 will show yesterday’s (one day back); a value of 2 will show 2 days back, etc…

Each individual register being shown in the Trend can have its low/high limits configured; this is done in the Channel tab of the Trend Display Object. Each register being shown (pen) should have its limits set; if the value is outside the limits set, it will not be shown on the trend graph.

See the “Trending, Sampling, and Data Backups (Mastering EBPro)” Sample Project for more information.

Content Created by David Franzwa