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Hello everyone
I am encountering an issue that appears to be EMI-related despite applying the usual mitigation steps.
EMI / System Setup:
VFD in steel enclosure
Input EMI filter
Ferrite rings on VFD output and all related cables
Shielded spindle/motor cables (grounded both ends)
AC/VFD cabling physically separated from DC lines
High-current DC cables are shielded and routed separately
Control Setup:
I am using the 7i96S encoder pins for MPG inputs (I have no motor or spindle encoders).
I do not have any unused OUT pins and only 4 available IN pins.
To get X, Y, Z, X1, X10, and X100 signals, I wired them to Raspberry Pi GPIO using external 10k pull-ups.
Issue
After wiring the MPG inputs, some of the pins intermittently remain latched HIGH or LOW, making jog selection unreliable. This problem has occurred twice, and both times it started after spindle-speed testing.
Earlier in setup, I believe I damaged one of the 7i96S step/dir channels. After that, instead of wiring STEP- and DIR- to GND and STEP+ / DIR+ to the respective inputs, I reversed them — STEP+ and DIR+ to +5V and STEP- / DIR- to the Mesa pins.I have since added additional ferrites and shielding, Ferrites on servo lines, data cables, and MPG cable
Steel mesh added to enclosure ventilation fans but the issue persists.
I am now planning to use the P1 pins on the 7i96S for X/Y/Z and X1/X10/X100 inputs instead.
W6 jumper is OFF.
Questions

1. The MPG has extra wires that appear intended to power LEDs or similar features. Can these be safely powered from the 5V rail, or is that risky for the inputs?
2. Where exactly are pin 1 and pin 2 physically located on the P1 expansion header?
3. Which P1 pins are appropriate to use for these MPG signals?
4. May I safely use 5V for the MPG input power in this configuration?
5. Any recommendations to avoid EMI issues when using these inputs on the 7i96S?
   
   Thank you for your help.
   
   
   

sudo halcompile --install cia402pv.comp

cnc@raspberrypi:~$ sudo halcompile --install cia402pv.comp
Traceback (most recent call last):
File "/usr/bin/halcompile", line 1553, in <module>
main()
File "/usr/bin/halcompile", line 1523, in main
process(f, mode, outfile)
File "/usr/bin/halcompile", line 1363, in process
a, b = parse(filename)
^^^^^^^^^^^^^^^
File "/usr/bin/halcompile", line 434, in parse
f = open(filename).read()
^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'cia402pv.comp'

@LangdonS,
He does that always, just have a browse through his posts.
@Oli,
Danke schon.

I'm going to write a separate 32 bit executable that loads the shared library, and presents a named pipe that I can access via Python.

I need to load a 32 bit shared library from GladeVCP/python to communicate with an existing machine. This shared library is only available as a 32 bit library for ARM systems, and I want to see if this will run on a Raspberry Pi. I don't have access to the source, so I can't recompile arm64.

Is there any way to do this, or do I have to run on a x86_64 machine?