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You need to be clearer please, loose terminology is confusing things.

You are using "machine" to mean multiple things.

Suggest:
Computer (the hardware linuxcnc runs one)
CNC machines

> as long as you do not need both running at the same time.

Exactly that's what I wanted.

Is there any workaround that could work, too, without having to use two separate machines?

That data suggests a 4.5V minimum input PWM voltage.

Also, if it has an optocoupler input, you can get a 5V signal
out of a 7I92/7I92T by wiring the PWM input to +5V and the PWM
input negative to the PWM output of the 7I92/7I92T.
In this case, you would need to invert the PWM output in
your hal file.
 

OK, that is not what i was thinking/answering, but the replies are still valid, namely most of the pin names would be the same on both instances.
But, having two separate machines/configs with two separate controllers/electronics is for sure possible ... as long as you do not need both running at the same time.

makerhero.com/img/files/download/3PSC3-m...bOy1GiYJwCPiI6EEGEI2

i talk about this thing... and i test now 500hz up to 3khz in 5ü0hz steps.. nothing changed.. i have 3 of them.

i wonder because the arduino brings the converter to 10v.

Maybe the OPTO input circuit requires 5V?

I guess you could test this by simple supplying +3.3VDC
to the input and seeing if you get 10V out

If you need 5V drive, you could put a stiff pullup
on the PWM pin to +5V (say 330 Ohm)

I guess it could also be a scaling issue
 a PWM value >= PWM scale will result in a fullscale
(stuck high) output