If you switch it to full the the camera goes all the way focus, from close up to infinity.
If you switch to limit then you limit distance but right now i don't remember if it is for close up to mid range or from mid range to infinity?
When i go home i can check and report. Which camera are you using?
If it is a99 or a77II you don't need to use this switch since the camera have in body focus limit range ( AF range)
PS: After checking the limit switch can limit both ends the close up to midrange and from midrange to infinity. To use this function, focus to either end and then turn the limit switch. Then the camera will use the focus range you have selected