Not familiar with that make of lathe, but usually the position sensor are inputs to the PLC to indicate in position, some have a double lot that indicate approach, or will go into slow when the adjacent position is reached, you need to get full documentation on the turret in order to supply and program, is there no support from the manufacturer?
If you are going with a separate PLC, almost any make will do, one of my favourite's is Mitsubishi.
you could output the M code bit from mach and then send a Fin(ish) signal back when in position.
I see it also has a probe included in the turret, you will need probe macro's also to put that in operation.
Whose make and type are the servo motors?
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.