Applies To:
  • CitectSCADA 5.xx, 6.xx
  • CitectHMI 5.xx, 6.xx

I am trying to connect CitectSCADA to a remote OPC server. When Citect starts up I get an error message “Out of Buffers NetTraceBuf” displayed in the Citect
Kernel (IOServer) “Main” window page, when the Kernel “NetBIOS” window was opened. This also affects the IO server from running normally.

What is the cause of this message error?

The problem happens when the specified OPC server is not registered on the PC where the Citect OPC driver failed to initialise when doing "Init Unit" command. In this case the OPC driver has popped up an Error dialog which holding up the IO Server from running normally. The impact on Kernel window "NetBios" display was the network traffic trace cannot get the free net trace buffer because the net trace display task stopped and the buffers are held resulting in the error "Out of Buffers NetTraceBuf" being displayed continuously as the net trace call runs in win32 thread continuously.

To resolve this issue make sure that the OPC server specified in the Citect project have been installed and registered correctly on the server.

Buffer, NetTraceBuf, Kernel, OPC