Hi Remigio,

Switching from familiar systems to WinCC Unified does indeed involve changes. Since there is no way to configure an OnChange event for a tag, you have to use another approach.

You can either use a TagSubscription object to allow a function to be triggered on a tag change, or you can use a dynamization script for a screen item property of your choice. Dynamization scripts use a trigger - by default it is set to trigger on all tags used within the scripts, resulting in a tag change triggered script.

For booth approaches, you will need to take care of the scope. If you need the functionality to work independently of any displayed screen, you can use the main window with screen window management.

Kind regards
Stefan