@chrishamm @Phaedrux
Thank you very much for your inputs. I first flashed the MB6HC to the newest firmware version using Bossa but this did not resolve the issue. Indeed it was a problem with the config.txt file. By changing dtoverlay=vc4-kms-v3d to dtoverlay=vc4-fkms-v3d I was able to get the system running. Have a nice evening!

@cedricundert Please share the output of M122 as well. If the RasPi isn't always available via ping, I'd tend to say there is a problem with your router or PC. I am not aware of any network problems with version 3.5.1.

@chrishamm it works well on my machines, thank you again for your time on my issue

@curieos said in M911, Print not Resuming After Voltage Threshold is Reached:

That is highly unlikely, the buffer provides enough power for the M911 codes to be run to completion

Sorry, I forgot:

this is supposed to be a large, industrial machine that offers power loss recovery as a selling point.

As a Pro, you sure have monitored the 24V and 3.3V rails’ behaviour on the event of sudden power loss - a cheapo two-channel scope is all you need. What I know for sure is that the resume.g file is generated by RRF on an undervoltage event as long as the Duet’s electronics have sufficient power to stay alive long enough. And I can assure you: 4 secs are long enough.

OTOH, your 3-4 seconds buffer supplies 22V, so it is meant to feed all steppers and heaters (excluding the bed) as well? These devices are operated by strong pulses - a voltage plot over these 3-4 secs might be interesting 😊

@curieos Conditional G-code is known to be relatively slow in software v3.4. I suggest you upgrade to v3.5 ASAP, because that should be significantly faster.

@curieos said in 6XD 5V Input Voltage Limits:

If the 5V supply in question were adjustable, and the 6XD were to allow some fraction of a volt over 5V, would it be possible to overcome the voltage drop from the protection circuitry?

Yes. The protection circuitry comprises a Schottky diode between 5V_EXT_IN and the 5V_EXT supply that you can pass to the Pi. This will drop around 0.4V. So you will need to provide about 5.6V from your PSU. Take care not to exceed 5.7V.

@e4d If you mounted the electronics in a metal box, can you confirm that the enclosure is properly grounded (GND)? You can stop DCS on the RockPi and check via gpiotools (gpioread AFAIR) if the input signal is correctly read once you hook up that line to GND and +3.3V respectively.