Will see if I can find the specs, may have them here if not will search Rockwells site.
Should be good drives and not old so should be good, Industrial drives are almost bullet proof.
The encoders look like they are 1000 line from the specs, that means 4000 counts per rev as far as Mach is concerned.
If you use the Rutex StepDir to analogue converters you will either need to use electronic gearing (if they have such a thing) or go with a SmoothStepper or be satisfied will slowish rapids. Electronic gearing is not great in my opinion, SmoothStepper is good but I have seen very little info on the Rutex converters so cant say on that.
Hood