Sooo,
I have tested it on the bench, without any other connectors than TB2 and TB1.
And i also created a new pncconf for my config.
NOW it shows 0V when resetted- S7100 M3 Shows 10,00V

)))))))
I will now try it again with the +28V of the machine- i will give it a try and answer how it went .
Thank you for your help- great forum!
Greetings