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I have never used EtherCAT as in doing a full setup, although i have fixed industrial machines using it i never had to mess with the EtherCAT part, so no idea.
I have used and use a lot of Mesa boards, they are worth every cent/penny/dime as they are extremely reliable and come with the best support on planet earth in the shape of PCW (an active member here), so i will not be switching to EtherCAT ever, especially since i learned it lacks some important stuff for me.
BTW, whatever the price for Mesa is, i have to pay at least double to get them here (black hole named Kosovo), still, i pay it gladly.
Reminds me, have to order some THCAD, installed the last one today.

The other part I always mess up is after installing.

so I’m going to config a machine with 7i76eu + thcad-2 (I think, whatever model the currently have). So I need to configure the system with plasmac

i alway alway forget how to set plasmac on the system.

Yes that one was the default. I just switched to the one Phil provided. Was able to run the materials in QTPlasmac but I seem to have an issue in Height control or maybe it was the consumable guess ill check that real quick...
Ok those look good but I'm getting intermittent raised cuts probably a settings issue in my HC but I've seen some PP create issues there as well. Im using the MESA THCad2 so its more than likely I haven't dialed that in correctly yet.

Thank you guys, I connected before the choke coil, there are 3kV capacitors so the voltage can't be higher than that. I used HV resistors.

Now I'm stucked with the arc voltage.
I placed a 9V battery on the input with a potmeter to test it. I set and calibrrated everything, encoder.0.velocity net to arc-voltage-in, the value changes with the pot but the arc voltage on the GUI and arc-voltage-out signal does not change, stays zero. Tried different scale settings, no result.
How to get that voltage?

Not sure about the analog input of your MESA hardware but it might be possible to use a MESA THCAD board which converts DC voltage to frequency and connects to an encoder input. But you would need to check if it is suitable for 3.3V

'M52 Pn' is Gcode so it would have to go into the Gcode program or be issued as an MDI command.

once you have the voltage (or frequency ) in HAL you can do all kinds of things including a PID loop to control the feedrate also a GUI panel should be trivial then.

forum.linuxcnc.org/plasma-laser/54413-th...-will-kill-it#314239

Hi,
    Has anyone had experience hooking up a CUT55-DS to a MESA THCAD. I contacted Yes Welder, but they gave me the brushoff.
I would like some help if there were any for this model. 

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