The invention relates to a control unit arrangement comprising a plurality of control units (1-3, 20-23) in a means of transport, said control units being networked by means of a first data bus (4). Said arrangement contains control units (1-3; 20-3) which are redundant in terms of a control function and a data bus disconnector (5) is associated with the redundantly embodied control units (1-- 3; 20-23), said disconnector connecting or disconnecting the data bus (4) according to an evaluation signal. In order to optimise the redundant arrangement, each of said data bus connectors (5) is connected to a signal line of at least one other redundant control unit (1-3; 20-23), another redundant control unit (2,3; 21; 23) transmits an evaluation signal to the data bus disconnector (5) associated with a first redundant control unit (1; 20; 22), the evaluation signal being the result of a functional test of the other redundant control unit (2,3; 21; 3) in terms of the first redundant control unit (1; 20; 22). The data bus disconnector (5) of the first redundant control unit (1; 20; 22) disconnects the data bus (4) according to the result of a logic circuit, at least one input signal of the logic circuit being formed by the at least one evaluation signal.