The invention relates to a method for the control of the travel movement of at least one service unit at a rotor-spinning machine, whereby the service unit services and/or controls an operating zone assigned to it containing a plurality of processing stations of the textile machine. The service unit is moved in the direction of its assigned operating zone when the detected position is located outside the assigned operating zone. In addition, the size of the operating zones is determined as a function of the workload of the service units and/or of the work efficiency of the service units.