Abstract: A transfer system for the exchange of data between dispersed devices in stored program controls with feedback over the process that is to be controlled. For the real time data transfer between a plurality of central processing units as well as between I/O components and the respectively allocated central processing units, aside from a system bus with nonpersistent access behavior, at least one lateral bus is provided, the transfer protocol of which includes a priority-persistent access behavior and at which at least two central processing units are connected. Moreover, at least one I/O bus is allocated to each central processing unit. The transfer protocol of the I/O bus, which is connected to at least one I/O device, includes a priority-persistent access behavior. Devices for configuring, controlling and observing are connected to the system bus in the waiting area. Sensors and actuators are connected to the I/O devices.