09 - How does distributed trending work?

The device may do trending itself. This way periodic time critical communication is not necessary. A MMI only needs to poll a device for data when a particular parameter is displayed on the screen. When the parameter is not displayed, polling need not be done.

A set of data, 16 samples, is collected over a short, user configurable, period of time and is then automatically sent in a single communication to the MMI where the long-term storage is done.