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So I set the jumpers on the 7i33 for X- and Z-axis to TTL (DOWN) and entered the USE INDEX- YES in the INI. Both axes behave normal and I think they home with using the index now.
Sequence:
Homing movement
Home switch trips- "home sw. X" gets yellow, "enable index" lights up yellow and the axis moves forward a bit further.Then the "hm2_7i80.0.encoder.00.input-index" flashes yellow very short, the axis frees the home switch and moves on to home-pos, stops and "x-axis homed" lights up yellow and the DRO says 0/0.

Z homes the same way. 

I think thats exactly what I wanted to achieve- correct? 
The spindle I guess can be indexed also, otherwise threading would be impossible...but the spindle likely just needs the index, A/B will not be necessary on a lathe- or am I wrong?
Well lets see how the next step can be solved.

The important hint was that the 7i33 just can process ALL inputs as TTL or ALL inputs as differential!
Thank you all so much
Sigi

Hi, please share your config files. If signals can be seen in Hal Meter there must be another config issue.

Does individual joint homing work?

(comment out the HOME_SEQUENCE settings in the .ini file)
 

Here's a basic try at this using the stepgen mapping:

0 = X
1 = Y
2 = Z
3 = A

 

The zip file includes the firmware and the modified pinout  source file

I use a bad power supply. I tested it with a laboratory power supply and it works fine with 5V now.

The behaviour does not change if I change the home_sequence values to: 0, 1, 2