b in addition ram 2 is also shown in a redundant configuration with ram 2 a being connected to bus 3 a and ram 2 b to bus 3 b other components need not be provided redundantly at least one memory for example rom 4 is only provided once in fig1 it is connected to bus 3 a the flash memory 5 also may be non redundant it too is shown connected to bus 3 a a flash memory is a nonvolatile read write storage in addition an interface module 6 may be provided which also may be non redundant in fig1 it is shown connected to bus 3 b signals from sensors 9 can be received via interface module 6 and output to actuators 10 therefore in order to reduce costs individual components for example rom 4 may be non redundant preferably the non redundant components are connected to one of the busses in order to ensure that the redundant cpus 1 a 1 b also receive or can transmit those data that concern components that are not connected to u201c their u201d bus or to the bus of their subsystem a transmitting device 7 8 is arranged between subsystems a and b and in particular between the busses with such transmitting device 7 8 transmitting the data of a non redundant component on one bus to the other bus thus it is ensured that the.