Abstract: A data processing switching system is disclosed including system units comprising processing units and memory banks and at least one storage input/output control governing the information traffic between the processing units and the memory banks via communication channels. The system contains an input control and an output control establishing links for the traffic. A plurality of communication paths for the information traffic is governed by these controls, the controls being characterized by means for grouping the processing units (VE) and the memory banks (SB) into a plurality of groups in number equal to the number of the communication paths currently available for seizure between the processing units and the memory banks or between the memory banks and the processing units. The processing units and memory banks include means for sending input or output requests to said input or output control, respectively.