No Input Signals

You mean just p15? or all the Input pins there are (P10-15)?

Because I already soldered 2.2kohms pull ups to each pin, exactly as in this pic :

I measured P10 P11 P12 P13 and P15 against GND. Result: All terminals (excluding P10, emergency kill switch) have 24V potential to gnd which drops to 0,07V when switch is closed.
Except from P10. This always has 0.00V potential :/

attach your config folder as a archive to this thread

those boards work fine with proximity switches ,
your connecting npn proximity switches yes ?
try inverting the input pin

the proximity sensor usually have 3 wires
black = input pin of bob
brown + 5v >+24v
blue = ground

what is the model of proximity switch ?

yes, NPN NO switches


I don't know if config helps, because the port check programme already says there is no input signal :/

And the programme def. works (I tested this via a wire with the paraport cable attached to my mobo. It when I connect f.e. p10 with p25 (gnd) I get a red dot for p10 in the programme)

proximity switch (Make is huchoo ?) model : CHE12-4NA-A710

I hope it is ok to post this link:

proximity switch

use hal configuration in axis , to test the pin input
it may only need the pin inverting

they work fine in linuxcnc

failing that post your full config

I now attach my config files. I try if proximity switch works with 5V.


I get the feeling I fried the BOB with my 24V . Though it has a 12V-24V Input specification. Or this is another translation mistake by the Chinese manufacturer :/

I can't use the proximity switches with 5V. I tested it and they start working at 12V. When I apply 5V a) the led won't light up and b) it won't switch from 5V to 0


I probably smoked the opto isolators, because I can't measure any potential drop at my added 2,2kOhm resistances (to be precise, when I measure the voltage in parallel to the resistance, there is a 0.00V on my multimeter). This might be the reason :/