Use a URL (like opcda://localhost/MyServer ) to point to your server.
The error message will often appear as soon as a dependent program is launched, with one of the following statements:
Note: The file may be named opcnetapi.dll (without the extra 'd') or opcnetapidll . Some distributions use OpcNetApi.Com.dll . opcnetapidll
Implement robust connection-state checking and reconnection loops in your code, as network glitches or DCOM timeouts can cleanly drop the underlying COM pointers wrapped by the DLL.
When you encounter an error related to opcnetapidll , do not simply download the file from a random "DLL download" website. That is a major security risk. Follow this structured approach: Use a URL (like opcda://localhost/MyServer ) to point
Since opcnetapi.dll is a .NET assembly that wraps native code:
Legacy COM-based OPC servers might need manual registration: Follow this structured approach: Since opcnetapi
: You must configure Component Services ( dcomcnfg ) on both the client and server machines. Ensure that the user account running the .NET client application has explicitly granted launch, activation, and access permissions for the target OPC Server.