EDE Bacnet Point Manager
This is the default view for the Points extension (or Points folder) under any BacnetDevice, and works similarly to the way other point managers work, which support online point discovery. Refer to the Niagara Drivers Guide for general details.
Discovered Pane
By default, the Discovered table for BACnet objects lists the single BACnet device object at top, and other objects underneath, with each object initially occupying a single row.
Figure 171. EDE Point Manager View 
To open this view, expand and double-click on the Points Folder.
Discovered pane
| Column | Description |
|---|---|
| Object Name | Displays the unique name of the discovered BACnet object. |
| Object ID | Identifies the discovered BACnet object. This number is a combination of BACnet object type and instance number (unique within that type). In this column, these two properties appear separated by a colon (:), using descriptors for type. |
| Property Id | Reports the Property ID for the discovered BACnet object. By default, all objects that have a Present_Value property are listed with this value on
top. BACnet objects without a Present_Value property (for example, a device object or trend log object) list showing another
property as the top Property ID.Typically, present value is the most useful piece of data from any BACnet object. However, you can expand any discovered
object to see all its properties as children in the Discovered pane, where each one is a separate proxy point candidate. Additionally, properties that are arrays are further expandable.
|
| Index | Reports a number into an arrayed property, if selected, otherwise this column cell is blank. |
| Value | Reports the static value of the associated property, captured when the system retrieved the object list (or, for any non-default
properties, when you expanded the top property).
Discovered values display showing any descriptors associated with the BACnet object’s related properties (Units, Active_Text, Inactive_Text, and so on). |
| Description | Reports any available character string Description for the BACnet object. In many cases, this value may be blank.
|
Database pane
The Database table contains existing BACnet proxy points, where each appears as a row in the table. Each proxy point represents one data item from a specific BACnet object in that device.
| Column | Description |
|---|---|
| Path | Reports the station path to the proxy point. |
| Name | Reports the name for the BACnet proxy point. If you added the point from a discover (selecting the default presentValue property),
and did not edit Object Name, this name is identical to the BACnet object’s name. As needed, you can edit this value.
|
| Type | Reports the type of point that the proxy is based upon (BooleanWritable, NumericPoint, etc.). |
| Out | Reports the current out value, including any point facets. This defaults to the single (configured) property value along with status for the proxy point. Since BACnet supports its own native status in addition to the Framework’s status, you can edit point facets to poll for additional properties, such as the native status Flags and/or priority Array levels. |
| Enabled | Reports if the proxy point is currently enabled for communication. |
| Object ID | Reports the Object Id property of the proxied BACnet object, which is a combination of BACnet object type and instance number (unique within that
type). In this column, these two properties appear separated by a colon (:), using descriptors for type.
|
| Property ID | Reports the BACnet property name proxied by the point. For example Present Value or Event State, depending on the selection.
|
| Index | Applies only if an arrayed property, like Priority Array (otherwise it is -1 for no index). Provides a numeric index into the property array.
|
| Tuning Policy Name | Identifies the name of the network’s tuning policy component assigned to the point. |
| Data Type | Identifies the ASN data type for the property (ENUMERATED, REAL, and so on). |
| Read | Identifies the read-only read status of the proxy extension, which is typically either Polled, COV, or unsubscribed, depending on a number of factors. If a read error occurs, other descriptive text may appear instead. |
| Write | Identifies the read-only write status of the proxy extension, which is typically read only if the proxy point is not writable or, if it is a writable point type, either writable or ok (the last write occurred within the effective tuning policy period). Or, if a write operation fails, the write status provides
some descriptive text.
For example, If you create a writable point for a read-only object (say, a NumericWritable for presentValue of an Analog_Input object), and attempt to write to it, the write status may show: Property:Write Access Denied. If the error is actually a BACnet Error, then this colon-separated format will contain the Error Class and Error Code returned by the device. |
| Device Facets | Reports the learned facets from the source BACnet object. |
| Facets | Reports the facets in use by the parent proxy point. |
| Conversion | Identifies the conversion used between device facets and point facets (typically Default).
|
| Read Value | Reports the last value read from device, and expressed in device facets. |
| Write Value | Reports the last value written using device facets. (Applies to writable types only.) |
| Fault cause | Displays the reason why the object is unable to connect the device. |
Buttons
- New Folder creates a new folder for devices. Each such folder provides its own set of manager views.
- New creates a new device record in the database.
- Edit opens the device’s database record for updating.
- Discover runs a discover job to locate installed devices, which appear in the Discovered pane. This view has a standard appearance that is similar to all Device Manager views.
- Cancel ends the current discovery job.
- Add inserts into the database a record for the discovered and selected object.
- Match associates a discovered device with a record that is already in the database.
- TagIt associates metadata, such as location or unique configuration with the object.