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The servomotor uses the ECAC XP200 driver, and according to the manual, the digital inputs can only be controlled with 24V.

I also have the ground for the 7i92 tied to the common ground.

Now the question becomes:
will the servo drive work with 5V on the inputs?
Did you check the manual?
Older drives do not, but all new-ish ones do.
-
Now i wonder if i missed how old is your drive!

Sorry, i missed 5V/24V thing above.
I edited the above posts.

The Isolator is doing 5V to 24V translation so unless the BOB has a relay/24V output
it cannot go directly to the VFD

Sounds like maybe  grounding issue (or damaged OPTO)

Note that a parallel port ground is nearly always frame ground
but the 7I92 ground may be floating
 

Deleted as i missed the part about level shifting.
Sorry.

PCW wrote:

I would check the output of the direction control PC817 with a voltmeter/ohmmeter

I checked for continuity between the V output and GND using a multimeter, and even though the LED is lit, there is no continuity. 


Tomorrow I’ll check the resistance at the output. It’s all very strange because I have two brand-new modules, and they behave the same way. 

They always worked perfectly on a parallel port, but I no longer have the PC with a parallel port to test them again...

I would check the output of the direction control PC817 with a voltmeter/ohmmeter

What do you recommend I use instead?

Deleted as i missed the 5V to 24V level shifting mentioned above.

ok this is driving me crazy. today i fired up the machine, turned on the spindle, hit reverse... and it worked. first time since swapping to the 7i92.

i thought maybe the gremlins had left, so i shut down the machine, powered it back up again, tried reverse — nothing. spindle just keeps going forward. led on the module still lights up, wiring is solid and untouched. literally didn't touch a single wire between the time it worked and the time it stopped.

any clue what could cause this?

More info.

@susan-parker,
very nice, that should come in handy for your project!

awesome! that would be a good machine for conversational probably if you have also a way to setup with quick change tool post. or always make parts that fit within the gang setup maybe!

@spumco:

In order to have a parts counter as a standard offering, I would think everything would need to be wired up to something, adding something like this in one of the user tabs seems like it would be the best fit.  maybe add them on the nice big blank sidebar user tab or along with the large DRO's on the side for X and Z.  I am not sure if linuxcnc has some form of build in part counter logic somewhere or not as i have not run across it, but you could use a simple macro call from gcode to add a count to a widget in the usertab for each time the macro gets triggered, this would be super simple to do and would not be something that got overwritten during updates if done in user tabs.that was the entire point of having those.  there is already lots of real estate under the large sidebar DRO's as seen in the picture:


 
 

Will do!

By the way, have you seen this 3D model by Marinus Jeuring:

grabcad.com/library/emco-compact-5-cnc-1

Just found it - includes the ATC!

Pretty awesome, lot of time was spent drawing this.