Hello dear friends,
I have a project with 28 remote PLCs and 1 central PLC. I'm using WinCC Professional.

Today, I wanted to run a test in simulation mode.
Let's say I have F1 and F7 PLCs. The tag names and DB structures are the same.

When I enter a value into the first set of the F7 program, the same value also appears in F1.
It behaves as if all PLCs share the same tag, but they don't.

The connections are different, the IPs are different, and the tag names are different.
Only the absolute addresses naturally match.

Can you help me ?

Right now, two PLCs are in simulation mode, but it behaves as if it is reading values from every PLC.

When I write 14 to PLC number 10, it writes 14 to all of them.
Even worse, it does this for every tag.

Hi rorshack,

have you tried to use the PLC name as a prefix? See Runtime settings > Tag settings > PLC name as prefix in the HMI tag name.