Mapping Variables For Use With a Trend Log Object

When using a Trend Log object within PcVue you must map the BACnet property that is recorded by the Trend Log object in the physical device, to one a variable. For example, you might map the Present Value property of an Analog Input object that is referenced by the Trend Log object.

In addition, the variable must have Trend Recording behavior configured.

The match between the variable, its trend behavior and the Trend Log is achieved as follow:

• The variable's mapping properties (BACnet object and property) are used to match the Trend Log configured to retrieve records for that given BACnet data.
• The trend behavior configuration defines in which archive unit the Trend Log records are stored.
• The variable's real time value reflects that of the real time value of the BACnet property, which is used for trend recording if the BACnet Trend Log cannot be found.
• The variable name identifies the records so that they can be retrieved later in a Trend Viewer, exported using Data Export etc.

The variable is mapped in the same way that you map a variable to any BACnet property or object. See the topic The BACnet mapping dialog and the book BACnet data sharing.