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Appendix B. Troubleshooting
Appendix B.1. Debugging a BACnet connection: Hints and tips
•Disconnect the FieldServer from the BACnet network when transferring BCU images to the BCU.
•Should duplicate object instances be accidentally configured in the FieldServer, the second call of the instance will overwrite the first one. This may result in a BACnet Object being “lost.”
•If “Virtual_BCU_…” is not being indicated as the device description for the FieldServer on the BACnet SCADA system, then the FieldServer is not communicating to the SCADA system. If the present value’s name is being indicated, but the present value shows question marks, then it is most likely that the Client side of the FieldServer is not communicating.
•If new points are added to the FieldServer it is important to restart the Summit Workstation or BCU, otherwise these new points might not be seen by the FieldServer.
•Poll only the BACnet addresses that exist in the device when communicating with Liebert systems. Polling addresses that are not configured in these systems will cause the connection to fail. The newer versions of Lieberts do not suffer from this problem. Please contact your Lieberts supplier for more information.
•Extra memory is required to store Map Descriptors that have the active/inactive text parameters specified. If the defaults are appropriate, do not specify these parameters. This will save memory and allow more Map Descriptors to be created
•
Appendix B.2. BACnet Specific Statistics
Stat | Description | Resolution | |
|
| It is normal to receive a few link control | |
| A | messages. If the number is higher than the | |
Link Control | transmit/receive messages, however, there | ||
was sent or received. | |||
| may be a problem with lost | ||
|
| ||
|
| communications.. | |
Unsupported | A request for an unsupported | This is not an error. BACnet clients often | |
poll all properties of a particular object to | |||
Properties | property was received. | ||
determine which properties are supported. | |||
|
| ||
| Data was requested but the |
| |
Segmentation | response would have exceeded the | This is not an error - the BACnet client will | |
maximum size of the APDU and | use a different method to read data from | ||
Not Supported | |||
could not be sent using an un- | the FieldServer. | ||
| |||
| segmented message. |
| |
Sequence Error | Invoke ID of a reply did not match | You should not see this message. It | |
the Invoke ID of the poll. | normally indicates a configuration error. | ||
| |||
|
| This typically happens when trying to write | |
Write Access | A write to an object was denied. | to an Input Object that is not | |
Denied | Service. It is not possible to write to Input | ||
| |||
|
| Objects. | |
Exception | A BACnet Service was denied | This may be a problem on the Client | |
system. Consult the PIC statement to | |||
Errors | because it is not supported | ||
determine what services are supported. | |||
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