Hello experts.

I migrated a project with a CPU 416 to a CPU 410-5H (PCS7 v7.1 to v8.1 SP1).
The project has a WinCC Appl and a WinCC Appl Ref..

I have already downloaded the program to CPU 410-5H and WinCC Appl is working correctly.

When I try to download to the PC with the WinCC referenced it shows an error:

"The project could not be opened. Database context does not exist or ..."

I also delete the WinCC Appl Ref, adding a new one into the multiproject and try it to download with the same error.

Any ideas.

Thank you in advance for your help

Hello DanLime,

WinCC Appl Ref is only needed for loading the same project
to an other PC in the network.
The problem is in the network-configuration or on the target-PC.
You should check your network-configuration according the
following FAQ:
"What are the requirements for operating SIMATIC WinCC in a Windows network?"

https://support.industry.siemens.com/cs/ww/en/view/868014

Regards

Georg Berghof