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Appendix C. Troubleshooting Tips
Appendix C.1. Debugging a BACnet connection – Hints and Tips
•Disconnect the FieldServer from the BACnet network when transferring images to the BCU.
•If duplicate object instances are accidentally configured in the FieldServer, the second call of the instance will overwrite the first one. This may cause a BACnet Object to be “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 with 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.
•When new points are added to the FieldServer it is important to restart the Summit Workstation or BCU, otherwise these new points may not be seen by the FieldServer.
•Polling BACnet addresses that are not configured for Lieberts systems may cause the connection to fail in older versions of Lieberts. Please contact your Lieberts supplier for more information.
•When a BACnet_PTP connection is established, and the connection is broken abruptly (for instance a power down), the BCU might not know immediately that this happened. If the FieldServer is the powered up again, it might take several seconds (up to 60 seconds) before polling will start again.
•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
•McQuay Units are shipped with a default Device instance of the last 6 digits of the McQuay Serial number.
Trane Specific Tips
•When new points are added to the FieldServer it is important to restart Summit Workstation or BCU, otherwise these new points may not be seen by the FieldServer.
•Disconnect the FieldServer from the BACnet network when transferring images to the BCU
Appendix C.2. | BACnet Specific Statistics |
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Stat |
| Description | Resolution |
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| It is normal to receive a few link control | |||
Link Control | A | messages. | If the number is higher than | |||
send or received. | the transmit/receive messages, there may | |||||
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| be a problem with lost communications. |
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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. | ||||
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| Data was requested but the |
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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. |
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| segmented message. |
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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. |
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| This typically happens when trying to write | |||
Write | Access | Writing to an object was denied. | to an Input Object that is not | |||
Denied |
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| Service. It is not possible to write to Input | |||
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| Objects. |
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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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FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com Tel: (408)
