BACnet and Rdbms

Import and Export descriptors configure importing (pull) from a station (usually a remote controller station) and exporting (push) data to another station (usually a Supervisor station).

An imported history effectively pulls data from a remote source station. For example, if a history import descriptor is under the Histories container of a NiagaraNetwork > NiagaraStation, the source is another history in the referenced remote station.

If a history import descriptor is under the Trend Logs of a BacnetDevice, the source is a BACnet Trend Log object residing in the BACnet device.

An exported history applies to a NiagaraStation (or database device under an RdbmsNetwork). An exported history exists in the local station, and is configured by a history export descriptor to push its data to a remote NiagaraStation (or RDBMS database). This adds it to the histories in that remote station (or to an RDBMS database).

Under a BacnetNetwork, the single LocalDevice component (that represents station data exported to BACnet) has a special view on its child Export Table component that permits exporting station histories as BACnet Trend Log objects.

You create history import descriptors and export descriptors under the Histories extension of a device using separate views.