About Bacnet Link Manager
Using Bacnet Link Manager view, you can manage the binding of Spyder
devices. The view also provides the link details of the Bacnet devices.
The following link details are displayed in the Bacnet Link Manager view.
- Link Status
Displays the current status of each link as NewLink, Bound,
or Obsolete. For more details, see Types
of Link Status.
- Device Status
Displays the status of the device as Downloaded, To be downloaded,
or Offline. If the device status is Downloaded, it
indicates that the bindings are downloaded to the controller. To be downloaded
indicates that the download is pending. If the device status is Offline,
it indicates that the device is not downloaded to the controller. .
- Source Device
Displays the name of the source Bacnet device whose output is linked or bound to the
destination Bacnet device.
- Source Object
Displays the name of the Bacnet object in the source device.
- Source Property
Displays the object property of the source object.
- Target Device:
Displays the name of the target Bacnet device.
- Target Object:
Displays the name of the Bacnet object in the target device.
- Target Property: Displays the object property of the target object. The object property
of the target device shows PresentValue for all objects, except AO and BO. When an AO or
BO object is selected as a target object, target property displays the priority selected.
- Poll or Push
Spyder Bacnet devices use a poll/push mechanism to share data on the network. Every Spyder
Bacnet device has 1 poll table and 1 push table, the size of each being 256. The tool
automatically decides the poll/push mechanism when you add a link. The push table on the
source Spyder is filled first and when there are no spare entries in the push table, the
poll table on the destination device is used. When there is binding between a Spyder and a
third party device, the push/poll table on the Spyder device is used depending on whether
it is a source or a target device. The status Poll implies that the
target device would poll the value periodically from the source device used in binding.
The interval for polling is the Update Rate configured on the destination object. The
status Push implies that the source device would push the value
periodically to the target device. The interval for pushing the data is the GPU interval
configured on the source object. You cannot select the mechanism to be used for binding.
Opening Bacnet Link Manager View
To access the Bacnet Link Manager view:
- Right-click Bacnet Network in the Nav tree and select View
> Bacnet Link Manager.
Bacnet Link Manager Commands
The following commands are available in the Bacnet Link Manager view-
Add
Click Add ,to bind two Spyder
Bacnet devices, or bind a Spyder Bacnet device and a third party Bacnet device.
Delete
Click Delete, to delete the links from the database. The link status
changes to Obselete after the deletion, to indicate that the link is
deleted only in the database. Click Bind, to remove the binding information from the
controller.
Refresh
Click Refresh, to refresh the status of the bindings between the
devices. The link status is displayed as NewLink, Bound,
or Obsolete, depending on whether the link is downloaded
to the device or is yet to be downloaded.
Bind
Click Bind, to download the binding information to the devices. The
link status is updated, after the Bind option is invoked.
Selective Bind
Click Selective Bind, to download the binding information selectively
to one or more devices.
Learn Link(s)
Click Learn Link(s), to learn the binding information from the
devices. The link status is updated, after the binding information is retrieved from the
device. On clicking Learn Link(s), all obsolete links are marked as Bound.
The NewLinks that are not yet downloaded to the controller are retained.
Note:
At any point, for Learn Link(s) to restore the link status from a Spyder
Bacnet device, the device has to be in downloaded state, that is, the application in
Control Program of the source device in Niagara should match that in the online device.
Otherwise Learn Links(s) does not learn links from that device.
The application in the target device involved in data sharing in Niagara
does not have to match that in the online device.
Clear Bindings
Click Clear Bindings, to clear all the links from the
device. The links that are in Bound and Obsolete states
are marked as NewLink.
Types of Link Status
Each link or binding in the Bacnet Link Manager view appears with a
status in the LinkStatus column. The links show one of the following
status, assuming there is no error.
- NewLink
If links are created between two or more devices and are not downloaded to the device.
- Bound
If links are created between two or more devices and are downloaded to the device. On
clicking the Bind button on the Bacnet Link Manager
view, all the links with a status as NewLink are converted to Bound.
- Obsolete
If links that are downloaded to the device are deleted. All links with a status as Bound
are changed to Obsolete when you click the Delete button
on the Bacnet Link Manager view. On clicking the Bind button
on the Bacnet Link Manager view, all links with a status as Obsolete
are deleted.
Error Conditions
Errors and warnings may occur while attempting to change or modify data when the
devices are bound. The following are some of the error conditions.
- After the devices are bound, a break in communication between the devices causes a Network
Communication alarm, which is displayed in the Alarms View.
- If the GPU rate of the source or target device is changed after the links are downloaded
to the device, then a warning message appears suggesting you to download the links once
again to the device. In the Bacnet Link Manager view, the links with the
status as Bound are changed to NewLink.
- If the GPU rate on the source is greater than the update rate on the target, a warning
message appears.
- When changing a point type results in the change of the Bacnet object type, a warning
message appears to delete the links. It may not be possible to bind the new object type
with the existing objects.
- When editing Bacnet objects from the Object Configuration View,
the links with status as Bound is changed to NewLink.
- If the source and target devices are third party devices, an error message appears.
Related Topics
Binding Lon Devices
Binding Bacnet Devices
Binding Jace and Spyder