Another Valid Arc Lost Post

I have used both methods, and they do work properly when set correctly, but i still prefer to use the hardware ARCOK, as can be noticed from the builds i do, i add that to most of the plasma cutters, be it with an reed contact or and inductor and some added electronics.
With software there are several issues to deal with to get it right, some plasma cutters will continue to output voltage in the range of 150 to 280V even after the torch is shut off since they have capacitors and that voltage will slowly fall back to 0 so for a split second when the torch is turned of the THC will start moving it down. Never really a big issue as it never reaches the material.
Some, especially inverter ones will have a 160 to 180V on the torch in cases where the pilot arc "missed" to transfer or did not strike an arc, so that will also cause the THC to synthesize the ARCOK signal and start moving torch down to lower the voltage while there is no arc or cutting going on.n Same thing happens on transformer plasma's but the voltage is much higher up to 280V, so the THC will move down rapidly and hit the material.
On my last build using THCAD i have the min arc voltage set to 80V and max at 150V to avoid any of those issues, and it works perfectly, never missed a single start.

Can you still fire the torch manually ?
If yes, fire it and check if you get that error, it seems you have grounding / shielding issues.

The "plasmac: arc-ok-in" signal should normally be false.

Seems like you might need to use the in-not to invert the signal

EDIT: oops, I misread that.

Can you zip your config file and post it here.

Well the g-code you posted works fine in a sim config although you need to reverse the cut direction for better edges, just tick the reverse cut in SheetCam and leave it that way. The smaller holes should be cut with a reduced velocity.

Are you sure your cut parameters are OK eg cut height cut feed rate etc?