Add OPC DA error：’OpcRcw.Comn.IOPCServerList2′ No such interface supported

[william]

I’m encountering an issue while trying to add an OPC DA server.
The error message is below:

The Chinese meaning in the picture is: No such interface supported.
The Rapid SCADA version is v6.1.
The OPC DA Server specification version is 2.0. It’s a DCS device.
The customer does not allow me to upgrade the DCS device.
How to solve this problem? Please help me. Thanks!

[Mikhail]

Possible cause is that OPC Core Components are not installed. Download them from Rapid SCADA or OPC Foundation website and install.

[william]

OPC Core Components has already been installed. Because I can connect and read back the data using other OPC Client tools.

[Mikhail]

Download OPC Core Components from this link and reinstall them.

[william]

Thanks for your reply.
Is the OPC Core Components installed on the OPC client or server?
The customer does not allow me to install anything on their DCS device (OPC server).
I am trying to read the source code. I would like to try replacing the unsupported functions (lOPCServerList2) with older versions. Is this the right way?

[Mikhail]

If you have different machines for client and server, install the components on the client computer.

I am trying to read the source code. I would like to try replacing the unsupported functions (lOPCServerList2) with older versions. Is this the right way?

I don’t think that you need to change the source code to fix this issue.

[william]

Maybe I didn’t describe the problem clearly, I’ll rephrase the problem.

There are 2 DCS devices (OPC DA server) and 1 computer here. The Rapid Scada Admin runs on this computer. The OPC Core Components has also been installed. I use Rapid Scada Admin to connect to DCS and configure OPC. DCS A succeeded, while DCS B reported an error during the connection. The error message was mentioned earlier.
The OPC Core Components on the computer(OPC client) should be functioning properly as DCS A can be configured normally.

I have run another OPC client app on this computer, which can connect to DCS A and DCS B normally and read back data. This indicates that DCS is also working normally.

The OPC versions of DCS A and DCS B may not be the same, and I suspect it may still be a compatibility issue. This OPC client app uses a lower version of the API, which is compatible with DCS B. Rapid Scada uses a higher version of the API, so it is not compatible with DCS B.

[Mikhail]

Thank you for the detailed explanation. As you can connect to DCS A, the OPC Core Components are installed correctly. Could you try BrowseOpcClassic just for test a connection?

[Mikhail]

The OPC client driver of Rapid SCADA uses the official .NET libraries provided by OPC Foundation to deal with OPC. I’m not sure that we can easily change them.

[fantacy]

i meet the same problem, have you fixed this issue now?

[fantacy]

If you fix this problem please let me know, thanks a lot~

[Mikhail]

Have you already tried the recommendations from this topic?

[fantacy]

Thank you for your reply! I tried to connect OPC DA server using BrowseOpcClassic but got the same error. When i use another OPC DA client to connect, everything is fine.

btw: how to upload local pictures to comments?

[fantacy]

I am not find the image upload portal

• This reply was modified 8 months, 1 week ago by fantacy.

[Mikhail]

Upload images to any free hosting (Google Drive, for example) and post a link here.

[Author]

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