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I dont think, that is possible.

If you wire the switches to the servo drive, you can use one of the drives internal homing methods. They allow a combination of home switch and encoder zero position. That will give you very high repeatability.

If you dont wire the switches to the servo drive, you are forced to the linuxcnc internal homing. Same with limit switches. This will reduce your repeatability to the repeatability of the home switch (you will need high precision home switches).

However if you use the servos internal homing in a gantry setup, you have to wire both gantry drives to the same switches. Servo based homing does not know about the mechanics of your gantry. You do not want two servos fighting each other and bending something.
Also maybe limit the torque during homing (PDO 6072)

My home switches are wired to the IO Modules. I only have one switch per joint
If i trigger the switches manually they getting recognised correctly in the hal show.
Do you know by a chance if its also possible the other way around?
So telling the driver like pin xy was triggered over the ethercat way?

My brain blockade right now is the following:
I have home switches configured like i did with steppers before. When triggered, shouldnt LCNC tell the Servo stop moving? Why do i need to home hooked to the drives.

If you need startup jogging and you need to tune the servo ... you need to turn off Lag monitor under the  Axis X.. Parameter ... Monitoring: Position Lag Monitor = False ...

If you have reduction factor ... you will determine it in the nominator and denominator rows somewhere in the drive manager ...

Yes one motor revolution == one encoder revolution ..

Yes HD should reverse you motion .. every odd 

This setting you generally free enable movement... next tune or you will need firmware update to start autotunnig the servo system ..