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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_MSTP connection is configured as a server, it is better to use a connection_type MSTP_Slave_Node. The only time when a server connection must be a Master_Node is when alarming has been established on the FieldServer.
•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.
•The FieldServer MAC_Address is configured using the System_Node_ID field (See section 4.2) This MAC_Address is used on the data_link (or physical) layer as the source or destination addresses. See section 9.1.1.2 of the BACnet ANSI/ASHREA standard for more information. The MAC_Address is not to be confused with the Node_ID setting (Section 4.4) that specifies the BACnet device object instance.
•When designing the MSTP network with multiple Master_Node devices, allocate the MAC_Address settings on the different devices starting at 1. This will allow you to specify a small Max_Master parameter and hence will improve overall network performance.
•When a FieldServer/ProtoCessor is configured to support MSTP virtual server nodes the firmware achieves this by implementing a virtual router and thus a network number is required so that it can expose its nodes to external devices as belonging to a specific network. (The default is network 5 if not specified). This network number is defined on the bridge descriptor as Network_Number. It must be unique for a site. Refer also to Section 5.1, Section 4.4 and Appendix A.1.
•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
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