Unable to cast COM object of type ‘System.__ComObject’

[mrfy]

Hello everyone,

I’m encountering an issue while trying to add an OPC Classic server, and I’ve attached a screenshot of the error message for reference:

Even when I manually configure the XML files in the ‘(…)\Instances\Default\ScadaComm\Config’ directory, I’m still getting similar errors, and I’ve included the relevant log entries below:

2023-09-04 15:44:05 Delay before connecting 4,7 sec
2023-09-04 15:44:10 Connect to Pro-face.OPCEx/{51ef7402-b5b3-4f68-82a1-557492a79b4a}
2023-09-04 15:44:10 Error connecting OPC server:
Unable to cast COM object of type 'System.__ComObject' to interface type 'OpcRcw.Comn.IOPCServerList2'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{9DD0B56C-AD9E-43EE-8305-487F3188BF7A}' failed due to the following error: Class not registered (0x80040154 (REGDB_E_CLASSNOTREG)).

Can anyone provide guidance on how to resolve this issue? Any help would be greatly appreciated. Thank you!

[mrfy]

My fault..
https://rapidscada.org/connecting-devices-using-opc-standard/

1. Download and install OPC Core Components. (…)

Mikhail please remove this topic.

[Mikhail]

Hi,

This topic is useful to avoid such mistake. Let it be.

[Author]

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