The present invention relates to an industrial robot system comprising a platform (1), an industrial robot (2) positioned on the platform and including a movable robot arm (6), a sensor system comprising two sensors (4, 5), wherein each of the sensors is configured to detect motions within an angle of at least 90° in a horizontal plane, and the sensors are arranged to detect motions of an object within at least one safety zone defined in relation to the sensors, and a control unit (7) configured to adjust the speed of the robot if a moving object is detected in the at least one safety zone (A, B). The platform (1) is adapted to be located in a robot cell when the robot performs work in the robot cell, and the robot system comprises two arms (10, 12) connected to the platform (1) and arranged to move the sensors (4, 5) in relation to the platform (1) between a retracted positon and an extended position and the sensors are located a distance of a least 0.5 m from the platform in the extended position, and the sensors are arranged to detect motions of an object within the at least one safety zone when the sensors are located in the extended position.