I currerntly released my own designed control panel for all my assembly lines robots.
Included are all typical buttons (I do have a book at home which lists all the buttons from one certain manufacturer).
If you have never seen real ones, just google "teach pendant" in google image search. On nearly every manufatorer's version the big large emergency shutdown button is easily recognized.
Render with raytraced AO:
Original hand-drafted design:
You can download it here:http://www.blendswap.com/3D-models/misc-objects/hi-poly-sci-fi-robot-teach-pendant/