Setpoint Mcode

Exactly I have to do this. I don't use Mesa but it brings lpt

Something like rolling axis that changes the 0 position each time a plank passes a sensor ?
That should be fairly easy to do, until a certain point:
Have that axis set to immediate homing, so no homing or limit switches for that axis,
Set that plank sensor to home that axis, any offset can be set in the ini file,
That would leave only the issue of homing an already homed axis, as that requires pressing enter or clicking on OK on the screen, but that should also be possible as i recall a while back someone made the machine that would home automatically on power up.

Well I'm sorry but I find this a somewhat tedious way to communicate.
If you want people here to help you with your problem it might be worth your while to write more than two sentences at a time.

Anyway :

If you need to set the X offset to 0 you could just use the laser sensor as an Hal input pin and call an MDI command when it becomes active:

Define MDI command in your INI:
[HALUI]
MDI_COMMAND = G10 L20 P0 X0 ( Set X to zero )

Then you can call this in your HAL:
net MDI-zerox <= your.sensor.input => halui.mdi-command-00

Or what Aciera said, that is even more elegant solution.
Thank you, Aciera.

hello nice solution tomorrow I try if it works thanks

you're right but translating Italian into English is sometimes very difficult for me