A flexible wiring system for an electronic system intermediate distribution unit points a (3) and and a switching control unit (57) on. The intermediate distribution unit (3) first side link ( [...] points), with an input side and an output side a real estate tax circuit (50) are connectable, second (CNA) side link, with input devices, such as various sensors, and output devices, such as various actuators, can be connected, and a changer, between one set of the first and a set of the ( [...] (1), [...] (2)) side linkside link is arranged (CNA (1), CNA (2)) second, on. The bill of exchange duty unit (57) controls the change-over device, so as to change a connection of the set of the first ( [...] (1), [...] (2)) with the set of side linkside link according to a specific (CNA (1), CNA (2)) second, with the set of the second device to be connected (CNA (1), CNA (2)) side link.