@dc42 Thanks

Hello,
My Z-axis reference is 30mm below the nozzle. I reference my z axis with an optical sensor using G30. How can I home the axle when the sensor is triggered?
I would like to check the Pin State and then decide what happens. My reasoning looks like this:

; homez.g
G1 X225 F400  ; Referenzposition

if(sensors.gpIn[!io2.in].value = 1) ; !io2.in pin optical sensor define with M558
	G91
        G1 Z50 F1000
	G90
	G30           
	G1 Z0 F600 ; Start Position
else 
	G30            
	G1 Z0 F600 ; Start Position

Is there a way to query the Z probe pin status because the sensor.gpIn dont work like this?