FieldServer FS-8704-06 instruction manual Appendix C.2 BACnet Specific Statistics

FS-8704-06 BACnet IP Driver Manual	Page 21 of 24
Appendix C. Troubleshooting Tips
Appendix C.1. Debugging a BACnet connection

•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.

•Polling BACnet addresses that are not configured for Liebert systems may cause the connection to fail in older versions of Liebert. Please contact your Liebert supplier for more information.

•Some of the BACnet IP features result in the creation of files (priarray.ini; desc.ini; alarms.ini) on the FieldServer. Sometimes updates of firmware can result in these files becoming outdated. Deleting these files will restore configuration defaults and may assist with configuration errors.

•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
Stat	Description	Resolution
		It is normal to receive a few link control
	A “who-is” link control message	messages. If the number is higher than the
Link Control		transmit/receive messages, however, there
	was send 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 Out-Of-
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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