Hi Zeev,

A major difference between the old WinCC Basic/Comfort/Advanced system and WinCC Unified is that WinCC Unified is a multi-client system. Due to the availability of Web Client access, the Panel Runtime can be operated by different users at the same time. However, there is only one process that executes the scheduled task. This means that these tasks are independent of the different clients and therefore cannot access the user interface.

To pass the screen number to the PLC, you can use the OnLoaded event of the screens. However, this solution will cause problems if multiple clients are used. You may find the FAQ Alternatives to the area pointer for Unified Panel helpful.

Kind regards
Stefan

Hello zeev145

It is not that simple as in WinCC Basic/Comfort/Advanced.

In Unified you can use Screenwindows so often there will be opened multible Screens or even the same screens in multible screen windows. So the question is, if you will change the basescreen.

If you want to keep that very simple screen hierarchie by changing the basescreen in Unified you can also dynamize the Main Screen window with at Tag:

Bye Murof