Modern robots provide usually multiple interfaces towards them, e.g. position, velocity, acceleration, force, etc. It is thinkable that in some cases a user wants to use different interfaces along the kinematic chain, e.g. position on joint 1-3 and velocity on joints 4-6. This is especially interesting for making very complex robots, like mobile manipulators, humanoid robots, etc.
Modern robots provide usually multiple interfaces towards them, e.g. position, velocity, acceleration, force, etc. It is thinkable that in some cases a user wants to use different interfaces along the kinematic chain, e.g. position on joint 1-3 and velocity on joints 4-6. This is especially interesting for making very complex robots, like mobile manipulators, humanoid robots, etc.