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Do you have any normal encoder, or a servo motor with encoder attached to it?
If yes, wire it and test, see if the same thing happens.
Do you have the spec for the MPG?

So this is the current setup 
And I have this HP PC here I can use for testing. 

I had a few more minutes to work on it this week - I wired the encoder via a short pigtail to the 7i77, got the same results as before. So the issue cannot be a faulty wiring connection.
I also found that my 5vdc power supply may not have been grounded, so I fixed that, no change, the PC still crashes.
I also tried all the other encoder locations on the 7i77, all producing the same issue.

I will keep updating as I do more.

Nice work, excited to test it out!

I am reminded of Excessive Overkill's youtube channel (around 18:39):  

 

Yes, this does not seem to be a latency issue but a connection issue.
Not really sure what the cause is. I have a 800 G1 here running
LinuxCNC without any Ethernet connection issues so I don't know.

Is is possible to try another PC to try and isolate the issue?



 

Rod, no amount of tuning is gona help on a disconnected link.
-
Did you change the cable?
Do you have a USB-to-LAN adapter to test with?
Do you have another PC to test with, any PC with a different cable.
-But, only after the Mesa is connected and trying to run LinuxCNC.

There are a lot more tuning settings required but lets get the main one
Can you type: echo $(nproc)
and then back in grub customizer add isolcpus=X where X = $(nproc)-1 from what is printed from the line above.
Then reboot.

My bad the PC is actually a HP Elitedesk 800 G1 USDT 
AMT is not disabled in BIOS where can I find those settings?   

OK a 8300 USDT uses Intel hardware and should be fine

Is AMT disabled in the BIOS?

So some background information my plasma table electronics and mesa 7i76e are not new the PC is new a newer HP elite 8300 USDT I swapped it out recently following issues with this post forum.linuxcnc.org/plasmac/53087-qtplasm...e-0-in-middle-of-cut 

I am not sure how do I find host hardware? 

is the

ip a

result still reasonable?

What is the host hardware?

how cool is that! great work! that opens a huge door for older Heidenhain scales to ethercat without the need of exe's. thank you very much!

I still get the same error after disabling eee 

The sudo grub-customizer did not disable eee for me.