New error No control?? 5i25 7i77 Over Voltage!

Iltereally changed nothing on the machine since it was last running fine and now I have a new error:
hm2/hm2_5i25.0: Smart serial card hm2_5i25.0.7i77.0.1 error = (28) Over
> Voltage

I am unable to turn on the machine. Halmeter doesn't seem to read the actual values going to the inputs.
If I hit e-stop on gmocappy it says it : Error: External ESTOP is set, could not change state.
I checked that all power supply voltages were proper and all was good.
Checked if any inputs were reading high voltages and found nothing.
Would this possibly be the Desktop PC's power supply voltage is too high.

That error would indicate that the 7I77s field voltage was too high

Field voltage is the same as it has always been.
4.88 and
23.99

OK well for some reason the field I/O section of the 7I77 thinks the field
voltage is too high. Is it possible there is some debris or contamination
on the 7I77?

I will look very closely tomorrow and be sure to blow it off.
Thanks for your help.

May be I am crazy, but I had a very similar problem on my laptop.
After I did a uname -a I realized, that my laptop did an update and it started with a non real time kernel.

Could you please check if you are running a preempt kernel?

Norbert

Thanks for your input Norbert.
Please excuse my ignorance of Linux but could you please give me a procedure to check if I am running a preempt kernel?
I did spend a little time trying to find out how but came back empty handed.
Also I will try updating Linuxcnc today as well as I still don't have all of the jog buttons on gmocappy.

eighthaxis wrote: Thanks for your input Norbert.
Please excuse my ignorance of Linux but could you please give me a procedure to check if I am running a preempt kernel?
I did spend a little time trying to find out how but came back empty handed.
Also I will try updating Linuxcnc today as well as I still don't have all of the jog buttons on gmocappy.

open a terminal and type uname -a

this should report back with what you are running and have RT in there

This is what it said:
josh@Bostomatic:~$ uname -a
Linux Bostomatic 4.9.0-13-rt-amd64 #1 SMP PREEMPT RT Debian 4.9.228-1 (2020-07-05) x86_64 GNU/Linux
josh@Bostomatic:~$

That is all good.
Can you measure the AC voltage on the 7i77 24V connector, then between + and - on that same connector and the machine GND for both AC and DC?