Ethernet connection to Mesa 7i76e disconnecting on its own after one minute

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25 May 2026 21:14 #346620 by RMJ fabrication
  I ran pnconf wizard and made a configuration for my CNC plasma table. I am able to home and jog my machine for about a minute until I get this error. 
It seems like the ethernet connection is disconnecting on its own somehow. Any ideas on how I could get the ethernet to stay connected so I can use my machine.
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25 May 2026 21:40 - 25 May 2026 23:01 #346622 by PCW
Is this possibly Plasma/EMI related?

That is, do you still get communication loss when the Plasma source is off?
Last edit: 25 May 2026 23:01 by PCW.

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25 May 2026 21:46 #346625 by RMJ fabrication
I don’t think it is Plasma/EMI related. My plasma cutter was not connected or turned on.

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25 May 2026 23:04 #346630 by PCW
What does:

sudo chrt 99 ping -i .001 -q -c 60000 [card_ip_address]

report? (it will run 1 minute then print statistics)

[card_ip_address] is either 10.10.10.10 or 192.168.1.121 depending on 7I76e jumpering

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26 May 2026 00:31 #346632 by RMJ fabrication
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26 May 2026 01:38 #346636 by PCW
Sounds like host or 7I76E issues

Whats does

ip a

report?
 

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26 May 2026 01:52 #346638 by RMJ fabrication
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26 May 2026 01:58 #346641 by tommylight
Did you try another LAN cable?
Is the machine and the PC grounded properly?
Use a DVM and measure between Mesa 24V GND and machine case, in AC mode, while the machine is ON, post result.

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26 May 2026 02:19 #346642 by RMJ fabrication
I did not try another LAN cable.
The machine and PC are grounded properly.
I dont have a DVM at the moment but as soon as I get one I will measure those.
I believe this is a software issue because even with qtplasmac not running I get the disconnected error every 45 seconds
 
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26 May 2026 03:06 #346644 by tommylight
Can you power off the machine and leave only Mesa powered?

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