The disclosure relates to a device comprising at least one delay line for applying a variable delay to a clock signal and a controller for controlling the variable delay of the delay line. The connection setting circuit includes a circuit capable of changing the mode of connection of the group of electric wires and the optical IO device. In the method for producing a molten metal, the feed material for molten metal production obtained by the method for producing a feed material for molten metal production is charged in a melting furnace to obtain a molten metal.