WinCC OPC Client DA - problem

Thank you for answer. I tried this :/ It's frustrating that simple OPC Client works but expensive WinCC has problems.. Any other solutions?

I assume that DCOM config is correct because I can connect via, for example, Matrikon OPC Explorer.

But what whats make me wonder, mostly OPC Clients use OPC Enum, but maybe WinCC use only register and thats the problem?

Hi,

you can try a later update of WinCC :

https://support.industry.siemens.com/cs/de/de/view/109762790

and get sure that there is one user on both systems who is absolutely the same. It means the same name and password for one user on both systems.

Additionally you can check name resolution which also often helps to resolve something like that:

https://support.industry.siemens.com/cs/de/de/view/868014

2. name resolution hosts, is important

WinCC requires a bit more than usual Clients like Scout, Expert or Matrikon clients.

Hi

I got the same problem with wincc pro V15.1. I founded on the web that you have this error if opc server is not installed (of course it is installed) or if you configure a wrong name on the client.

Because all others clients (excpt wincc) was working properly i assumed that the error was because of the name.

I solved it by replacing the opc server name by the class ID like {3C4AD541-1307-11D3-8CB0-006008C16337} and it work properly.

If founded the class ID with a free opc client  downloaded on https://www.kassl.de/

good luck

Laurent