via the signal lines 5 with the consumer units 9 the corresponding signals are fed from there via the combination connectors 14 and the combination lines 12 to the feed air signal distributors 13 and from there via the bus connection 18 to the control unit 19 fig4 shows in section and in somewhat more detail an individual consumer unit 9 fully corresponding in function to the arrangements according to fig2 and 3 connected to the related feed air signal distributor 13 the working areas 7 8 of the consumer 1 situated at both ends of the piston 21 are connected with the switching device 6 via pressure lines 2 arranged directly at the consumer 1 the switching device is designed in this instance as a piston slide valve 23 driven via an electromagnetic pilot valve 22 at the end of the slider 24 opposite the pilot valve 22 a spring 25 is arranged that ensures the pressure impact on the working area 7 when the magnet is without current while in the case of an electrically actuated pilot valve 22 the slider 24 moves pneumatically against the force of the spring 25 into the other end position and the working area 8 is connected with the supply pressure line 11 air evacuation connections 28 and 29 for the two working areas 7 8 enable the respective working area to have air evacuated therefrom directly into the open air based on the corresponding position of the slider 24 in a housing of the consumer unit 9 above the switching device 6 a board 26 with electrical or electronic components 27 is suggested this is connected on the one hand via the combination connector 14 with the signal line or lines 10 in the combination line 12 and on.