A control device for controlling power devices of vehicles or a means of transport, comprising a first and a second electronic control unit which are interconnected, wherein the first and the second electronic control units are connectable to a first and a second power device, respectively, and wherein the interconnection comprises a bi-directional plastic optical fiber through which data can be exchanged. In one embodiment, a series control network is provided, comprising the control device and at least one further electronic control unit, interconnected in series to the first or second electronic control unit, wherein each interconnection comprises a bi-directional plastic optical fiber or two single-directional plastic optical fibers through which data can be exchanged. In another embodiment, a ring control network comprising a series control network, wherein the two electronic control units at the two ends of the series are interconnected by a further bi-directional plastic optical fiber or by two further single-directional plastic optical fibers through which data can be exchanged.