The incident occurred when the man, a robotics company employee in his 40s, was inspecting the robot.
The robotic arm, confusing the man for a box of vegetables, grabbed him and pushed his body against the conveyer belt, crushing his face and chest, South Korean news agency Yonhap said.
He was sent to hospital but later died.
LOTO or lock out, tag out is a safety practice of physical locking out any and all energy sources attached to a piece of equipment. Gravity, electrical, chemical, potential, pneumatic, hydraulic. You put a lock on it with a tag stating your name, date and typically a reason. You keep that key for that lock so no one else can energize.