There is provided a control system for controlling safety-critical processes that includes a fieldbus, a bus master for controlling a communication via the fieldbus, at least one signal unit for linking to at least one of the safety-critical processes, and a first control unit for controlling at least one of the safety-critical processes. The fibers include a polycarboxylic acid covalently coupled to the fibers. Electrical power from the fuel cell is utilized to power a number of electrical accessories associated with the engine including system electronics and lighting.