In the remotemachine you need to install/register the SiemensOPC DA Automation and your dependences. You get a fail in the CoCreateInstanceEx, because the remote machine don't know the objects of this library.

Hi,

Only a correction, this library is not of Siemens. She can be named OPCDAAUTO.DLL or ISOPCDAAUTO.DLL (my case with a old version of Simatic Net).

See this manual.
http://support.automation.siemens.com/WW/view/en/13679516

Hi,

When you created your VC++ application using the Simatic Net to communicate with the OPC Server of Siemens, you probably used the library called "OPC DA Automation" (OPCDAAUTO.DLL or ISOPCDAAUTO.DLL). Check the link and imports that your code makes.

If you run the application in a machine with Simatic Net installed, all be ok, if not, the application can't create a instance of objects from a necessary library, and by reports the library that you need is the "OPC DA Automation".