Need help using one pin for two inputs

net all-home <= parport.0.pin-11-in-not
net all-home parport.0.pin-11-in-not => debounce.0.0.in

Is a way to avoid the error message. Whether it will have the desired function is a different question

Giuseppe wrote:

i want two switches on one bob input.
one homing switch and one floating switch.
this should be possible or not?

In this case it probably is. You can use the input to home, then later use it for the float switch. As long as the float switch does not trigger during homing (or only when homing the Z) it is likely to be fine.

In the example I gave your float switch signal still exists on the output of the debounce. The signal names in the net command can be anything. Change to "all-home-and-float-switch" on both lines, if you prefer. Or any other name that makes sense to you.

Can you try setting to "X" instead of "out" in the hal file, the loadrt line with parallel port address and see if LinuxCNC starts.
That will give you 9 inputs and 8 outputs.
All the built in ports i have tested can do that, even some add on cards can do that.

Do not fire the torch if it is casing issue, it will destroy something.
Have a look here, shielding and grounding issues are hard to pinpoint, but a bit systematic checking will work nicely.
Is there proper grounding in the shop?
Is there a GFI or FID or .... ? If there is such a "fuse", to test if it is working and there is grounding, connect the NEUTRAL to the GROUND with an isolated piece of wire with stripped ends, it should cut power to everything in the shop, not just some things. If it does not trip, there is no grounding so you will have to provide that by inserting coper rods deep into the ground some 2 to 3 meters away from the shop.
forum.linuxcnc.org/plasma-laser/35349-cn...fo-and-guide?start=0