1. A robot system, comprising at least one robot located in a metallurgical or rolling plant and assigned there to a work area of a worker for interaction with the worker; a robot control unit with various operating modes for controlling the robot, where the operating modes allow different forms of interaction between the worker and the robot and various types of operation for the robot, wherein the forms of interaction permit tasks to be executed with various divisions of labor and with divisions of the task in various ways with respect to time and space, wherein types of operation represent different degrees of automation of the robot and are designed to be adapted to hazardous or difficult activities in the work area; and a human-robot interface assigned to the robot control unit for flexible adaptation of the robot to different functionalities and/or work activities by turning on or off one of several available modes and/or types of operation by the worker.