The present invention relates to an arrangement for controlling a plurality of controllable devices (55a, 55b) connected to at least one common bus (24). The arrangement comprises at least one input member (21) and at least one output member (22) interconnected through said common bus (24), each input and output member having at least one input terminal (35) and at least one output terminal (45), respectively. Each input/output terminal has a unique identity, said input member (21) being arranged to receive a control signal from at least one control arrangement (51a-51c) connected to said at least one input terminal (35) of said input member. The control signal generates an action signal comprising an address corresponding to a unique identity of an output terminal of said output member (22) connected to at least one of said controllable devices (55a, 55b). The action signal is provided on said common bus by said input member to be received by said output member.