The employer needs to accomodate you IF it can do so reasonably. In the context of light duty, that means if that if you have some work restrictions, IF there is a way you can do your job--the one you were hired for--in a "light duty" fashion, it needs to let you. But it does not need to give you a different job than the one you had, make up a new, light duty job, or pay you if you can't do the job you were hired for.