Correct, using Group inputs and outputs is standard. As HawkME suggested, for the communication with the vision system you should contact Liberty Reach.
They can tell you which options are required on the robot side. They normally also provide some interfaces (at least for the most common robot manufacturers) for easy communication and integration of the vision system.
Yes, I just reached out to Liberty Reach and they said that they'll email me a bunch of information on the subject.
The specifics became really complicated really quickly.