Trumpy:
In our company, we use all manner of "safety" equipment, most having been listed before. These include: Safety E-stops, light curtains, photohelics, safety cables, physical barriers, emergency pendant switching (which moves all controls to the pendant, disabling all other controls during an emergency) and pressure sensitive mats.
All have their high points and lows, and each can be defeated in different ways depending on who attempts the defeating.
What exactly do you want to know???
