I would think the only advantage is in response speed, Now with fast scan PLC's, although being sequential logic, the need for speed in machine control is moot.
The typical scan time of a PLC ladder update can far exceed the pick-up/drop-out time of an average contactor.
In fact early machine CNC machines used relay logic to control the machine logic side of things.
IOW, I don't really see any apparent difference between Camsoft and any commercial CNC system, as far as logic programming or in the speed of my DOS program operating a Galil DMC-1000.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.