1. A bus system for a unit, comprising: a plurality of electrically independent bus segments; and a plurality of nodes separating the bus segments and actively connecting and disconnecting at least two of the plurality of bus segments via at least one of i) a gate, ii) a switching element, iii) a driver, and iv) a register, each of the nodes including: a respective routing table storing setup information for connections, and a respective monitoring unit independently verifying whether a connection can be set up.