INDUSTRIAL ROBOT SYSTEM OPTICALLY INDICATING MOTION AREA OF ROBOT

A robot system includes a robot installed on a floor surface, an irradiating unit irradiating visible light onto the floor surface, and a forcible stopping unit forcibly stopping the robot from moving when there occurs an abnormality. The radiating unit is controlled by a control unit such that visible light is radiated onto motion and latent areas on the floor surface. The motion area is an area occupied on the floor surface by a space within which the robot is allowed to move during execution of a task. The latent area is an area occupied on the floor surface by a space within which the robot is likely to move until the robot is forcibly stopped from moving by the forcible stopping unit. The control unit sets the latent area depending on whether or not an execution acceleration of the robot is higher than or equal to a predetermined acceleration.