Hi,
I suspect DMMs have a very similar set up to the Allen Bradley drive. There will be a programmable register for following error, or whatever DMM
call it.
I suspect also that you can program what the fault signal includes. The Allen Bradley has alarms for over voltage, over current, over heat, following error.
They can be combined into one fault line or over several lines. Such line would be hooked to Mach and then you program Mach how to handle them.
There is also an alarm reset, if memory serves its a distinct input on the Allen Bradley but with many drives it a pulse Mach applies to the fault line
that resets the drive.
Time to look at the manual.
Does DMM have servo setup software that you install as an application on your PC? If it does you might use the software scope to observe your servo while
doing a Gcode job and detect a loss of position. It would give you valuable insight as to how servos work and following errors.
Craig