Hello,

years ago the company I worked in as an IT guy had an automated tape library in the data center. It was an early system based on an industrial robot moving along a rail; the robot arm could fetch a tape cartridge in rotating storage cells, then move towards one of several tape units to load it into. The moving robot weighted in the order of magnitude ~200kg and moved rather fast, it could easily kill a man. A wire netting cage prevented hazards; opening the door would shut the robot immediately down.