Data point Elements (Properties) of BACnet Objects
Properties are parameters of objects, i.e. a property that is characteristic of an object. In WinCC OA a property equates to a data point element.
Properties of particular object types are either mandatory or optional. Whether the value/state of an optional property is given depends on the support of e.g. intrinsic reporting, command priority, segmentation, etc. by the BACnet device. Properties can either be only readable or readable and writable (changeable by BACnet services).
These two differences are not specified in the following table, but rather in the related object type chapter.
The following table only describes WinCC OA specific properties of BACnet objects (I/O objects). Refer to BACnet literature for a description of data point elements which directly represent BACnet properties.
The Present_Value Property of an object type will be described in the related chapter (except for BACnet_AI, BACnet_AO and BACnet_AV).
|
Data point element (property) |
Data type | Available in the following object types | Description |
|---|---|---|---|
| Present_Value.value | unsigned integer | BACnet_AI, BACnet_AO, BACnet_AV, | The present value. |
| Present_Value.C1.AVG_WT0 | float | BACnet_AI, BACnet_AO, BACnet_AV, | Average value in the 5 minutes archive. |
| Present_Value.C2.AVG_WT0 | float | BACnet_AI, BACnet_AO, BACnet_AV, | Average value in the hour archive. |
| Present_Value.C2.MIN | float | BACnet_AI, BACnet_AO, BACnet_AV, | Minimum value in the hour archive. |
| Present_Value.C2.MAX | float | BACnet_AI, BACnet_AO, BACnet_AV, | Maximum value in the hour archive. |
| Present_Value.C3.AVG_WT0 | float | BACnet_AI, BACnet_AO, BACnet_AV, | Average value in the day archive. |
| Present_Value.C3.MIN | float | BACnet_AI, BACnet_AO, BACnet_AV, | Minimum value in the day archive. |
| Present_Value.C3.MAX | float | BACnet_AI, BACnet_AO, BACnet_AV, | Maximum value in the day archive. |
| Present_Value.C4.AVG_WT0 | float | BACnet_AI, BACnet_AO, BACnet_AV, | Average value in the command archive. |
| Present_Value.C4.MIN | float | BACnet_AI, BACnet_AO, BACnet_AV, | Minimum value in the command archive. |
| Present_Value.C4.MAX | float | BACnet_AI, BACnet_AO, BACnet_AV, | Maximum value in the command archive. |
