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In the settings I found a 2nd Probe Pin. In the Manual I couldn't find a description for thin Pin.
How I have or how I can use it?

The 2 probe pins work OR wired, I mean their active states are OR wired, so any of the 2 probe inputs trigger will trigger the probe.
And the probing routine can be executed with the G31 command, for details please check the UCCNC manual.

And we've added a 2nd probe input, because wiring more than one probe sensors together is not always possible, or at least sometimes it is not easy,
for example when one sensor has a normally open and the other a normally closed output and this is mostly the case when one probe is a flying one and the other is a tool length sensor.

Ah, ok
This is a good idea. I'll add a 2nd tool for probing as well.
So, this information is really helpful.

Thanks