In large industrial plants it is often necessary to link the safety signals of a plant. To achieve this, potential-free contacts are wired from machine to machine or to a higher-level safety controller. Subsequent changes in the safety concept are therefore often difficult to implement. Long lines and cable routing make the safety concept inflexible and expensive. With the Safety Simplifier, a safety concept becomes attractive and can be implemented quickly. A Safety Simplifier is mounted on each machine. This either monitors the safety technology of the plant completely or only takes over the function of the safe linking of the plant, if another safety technology is already installed. Up to 256 safe signals can be exchanged via the safe wireless or CAN interface.