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Please excuse the n00b questions as I work to setup my small AXYZ cnc router. Does anyone know how I should
implement limit switches in Linuxcnc? The factory wiring of my old millennium cnc router has a single blue tipped inductive proximity limit sensor on each axis. The sensors are located at the top of the z-axis, front of the y-axis and left on the x-axis. Each sensor has connections notated sig, 12v and ground. 

My assumption is that these are NPN, Normally Open (NO), but will confirm:

• Normal state (no metal detected): Sig wire outputs ~12V

Activated state (metal detected): Sig wire outputs ~0V

Two questions:
1) Will these play nicely with the 7i96s card I’ve ordered?
2) Are these be sufficient for homing the router? 
 

I would need a Bitfile for the 6i25, the 7i74 is on P3 and the 7i85 is on P2, if that possiple ?

[code]about the laptop/PC, try to reinstall the rio.c component:

[code]sudo halcompile --install riocore/files/rio.c

[/code][/code]


 

It worked, problem was on the hadrware side. Another USB Hub did the trick.

Better to use the on card 7I95T encoders for machine feedback.
You can put high speed encoders on the expansion ports
but for feedback use its better to use differential signaling
and the 7I95T already has 6 encoder input designed for this.

halcmd (and hal)  are fine with true/false for bit types:

pcw@pcw-HP-Compaq-Elite-8300-USDT:~/linuxcnc-dev/src/hal/components$ halcmd setp hm2_7i96s.0.ssr.00.out-00 true
pcw@pcw-HP-Compaq-Elite-8300-USDT:~/linuxcnc-dev/src/hal/components$ halcmd getp hm2_7i96s.0.ssr.00.out-00 TRUE

pi@raspberrypi5:~/linuxcnc/nc_files $ ./M101
bash: ./M101: cannot execute: required file not found

Likely means that bash was not found.



 

To PCW: I would use 5v encoders... are the parallel expansion ports capable of high speed encoders? like 1um linear scales?
7i73 looks like a nice option as well.
Thanks!

I do understand you can vary the scaling of the ppr->movement, the machine im retrofitting never had any scale switch, though never using this machine originally, i dont know exactly how it functioned. It is a good idea though. Thanks!

It's finding bash fine, the command requires either a 0 or 1 as input, going by the error message, not a "True" or "False"


It's kind of hard to debug without seeing the script.

My comment regarding true or false is incorrect, thanks PCW.

Should the command be run from a bash command line or within a halcmd session ?

I've gone all rusty as of late...must be the dust from the build garage storage

Awesome. Glad it's working!

Success!
I moved that line to my posthui.hal and now everything works. 

# --- ESTOP-EXT ---
net pendant-estop     <= hm2_7i76e.0.7i76.0.0.input-29

Thx for the support.