Thanks Kenny and Nosmoking here is the Reply I received from Andrew at Mach motion:
" John,
What are the old Fanuc motors rated at, as far as motor RPM and torque? If you can get me this info than I can match it up to the Mitsubishi servos and let you know. The Mitsubishi drives have 4 control modes, differential step and dir, +-10v ( I think torque or speed modes) and positioning sequencing normally activated with a digital input.
We have a little adapter card that connects to the top of the drive for easy access to the step and dir and drive error signal. It also allows us to use a standard Cat5 cable as the control cable. We have another mod-jack on the drive for emulated encoder out put, that will be used down the road with a motion controller.
If you will be using the drives in position mode than you can use their on-the-fly-auto tuning, which I think surpasses any other brand of servo drives on the market. "
I can see now that the adapter board is used for easy connection only.
I wanted to use the Galil as I intend to use Etel Ring motors on the 4th and 5th axis and these will be using different drives to the Mitsubishi and may not be compatible with the step and dir out put from Mach3 (still waiting for info on the Etel motors!) ...
John