Abstract: In an industrial plant for producing or processing liquid, red-hot or hot metal a safety-relevant area is formed in the direct vicinity of the liquid or red-hot metal and the presence of a person is at least periodically not allowed. A detector unit is provided for the surveillance of the area, detecting electromagnetic radiation emitted by a present person or identifying the absence of electromagnetic radiation blocked by a present person. Furthermore, an evaluation unit is able to detect the presence of a person from the output data of the detector unit, and for a control unit which is connected to the evaluation unit. If a person is present in the safety-relevant area, the control unit automatically initiates an action acting against the presence of the person. By forming a plurality of safety-relevant areas having different danger levels, gentle stopping of the industrial plant is made possible.

Abstract: A control for a drive reel partitions the reel into a plurality of angle-of-rotation segments. Compensation signals are produced by detecting deviations from a selected parameter at each of said segments. The compensation signals result from subjecting the deviations to integration wherein a plurality of integrators are included for this purpose, one for each of the segments.