Control system for controlling security-critical processes

(57) The control system for a process with indispensable summary subject safety is offered. Solution means The first control unit 14; 14 for the control system 10 to control the processes 28 and 30 with indispensable safety, and 54, It has the field bus 12 which connects the signal units 18 and 20 combined with the processes 28 and 30 through the I/O channel, 22; 18, 20, 22, 56, and the first control unit and signal unit, and the bus master 36 for controlling the communication on the field bus 12. The first control unit 14; 14, 54 and the signal units 18 and 20, 22; 18, 20, 22, and 56 have the safe inclination systems 42 and 52 for guaranteeing communication of the fail-safe between units. The bus master 36 is connected to the field bus 12 separately the first control unit 14; 14, 54 and the signal units 18 and 20, 22; 18, 20, 22, and 56.