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Hello PCW! Thanks for your hints yesterday.

I did some pings and latency histograms, I hope I can put the photos in here. I thought both was allright, but this motor-0-position errors (and "error-finishing-read" at start) seems to be persistent.
BTW, I tried the most of this thread: forum.linuxcnc.org/38-general-linuxcnc-q...ead-and-irq-affinity and it was very successful in this regard, except these errors.
I think I try servo thread with 2 ms.
   

   

   

Thank you for your support!
Hanno

The idea to power it from 24V stuck, I am going to do it that way. Will get rid of a 5V power supply in the cabinet.

The voltage reader can fit in a connector, that would be possible, but not the EtherCAT components. They need say 100x60 mm as it is today.
Two-sided and dense packing, no still not inside a connector.
I will try that idea to put the EtherCAT function on the plasma cutter. It doesn't make sense for me since it is a matter of 0.5 meter, but why not?
Could be a question of how long the ethernet cable can safely be versus how long the I2C cable can be.
That power injector/ejector is here on Monday.

I have a Herocut 55i, it is all very small scale, hobby and prototypes for my enjoyment.
I get voltage, arc-ok and can control torch-on. Power level, air pressure isn't, well require more work than I want to spend right now.

Must also say I am very happy with QtPlasmaC, works really nice.