A device for a data and energy management in a vehicle having a connecting arrangement via which a superordinate control unit may be connected to at least one subordinate control system, respectively, the superordinate control unit having a superordinate interface and the at least one subordinate control system having a subordinate interface, using which, the superordinate control unit and the at least one subordinate control system exchange data of at least one electrical user via the connecting arrangement, for the purpose of a bidirectional communication. In an advantageous manner there is the possibility that in the case of an energy demand by the at least one subordinate control system via a first connecting arrangement, purposefully at least one additional connecting arrangement is able to be deactivated and/or activated by at least one superordinate switching arrangement of the superordinate control unit, in order to fulfill the desired energy demand.