The masso motors go a different way than industrial standard, you only have a single ended 24V= input on enable and therefore you need a common ground, “motor -” and “controller -” has to be tight together - which is done in the onefinitiy, as there is only one common power supply for controller and motors.
A third party device with ENA+ and ENA- just exposed the LED of the opto coupler to the controller, therefore you can’t simple just put one wire here. In addition the voltage level is different and the logic is different, this was discussed already here
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