Usage of Bacnet virtual points

There are two primary uses for Bacnet virtual points:

Virtuals are transient vs. persisted components—they are dynamically created (and subscribed) only when accessed, and are not permanently stored in the station database. This precludes any linking to or from virtuals—as links would be lost. Nor are point extensions (alarm, history) supported under virtual components. These things require use of Bacnet proxy points, which are persisted in the station database.