The Trend Logs device extension under the BacnetDevice allows you to import BACnet Trend Log objects in the device into the station as Niagara histories. For general information on this device extension, see “About the Histories extension” in the Drivers Guide.
Starting in build 3.6.40.1 of the BACnet driver, the Trend Logs device extension also supports BACnet Trend Log Multiple objects, in addition to Trend Log objects.
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A BACnet Trend Log Multiple object can monitor/record values of one or more properties of one or more referenced objects, either in the same device as the Trend Log Multiple object, or in an external device. A key feature is that all values are recorded using the same timestamp.
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Instead of a BacnetHistoryImport descriptor, Niagara uses a BacnetTrendLogMultipleImport descriptor to import a Trend Log Multiple object. One import descriptor typically results in multiple Niagara histories in the station—one history per object/property value in the record.
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Each BacnetTrendLogMultipleImport descriptor component has a special default view: the Bacnet Trend Multiple View. For more details, see Bacnet Trend Multiple View.
See the following sections about Trend Log imports:
A BACnet device must contain Trend Log objects (and/or Trend Log Multiple objects) to make use of this feature. A Discover
command will determine this—if no such objects are found, the Trend Logs extension has no practical application.