Error message 0x80004002 when trying to access objects under an OPC server in the Vista OPC tool


Get error message 0x80004002 when trying to access objects under an OPC server in the Vista OPC tool.
It is possible to see the OPC server but get the error when accessing the object under it.

Product Line

TAC Vista


  • Vista 5.1.5
  • Vista OPC tool


For some reason some important DLLs for OPC were not registered on the client PC.


Register the following DLLs:

  • opccomn_ps.dll
  • opc_aeps.dll
  • opchda_ps.dll
  • opcproxy.dll