FSA (For Safety Applications) version the EKS is now suitable for machine safety applications. The EKS FSA has additional switched outputs that can be utilized to form a safe shut-down signal. With a personalized EKS Electronic-Key the machine operator can now be given authorization to also perform setup and maintenance work, or similar critical actions. The currently widespread problem of safety guard tampering is solved. The machine is reset to a safe operating mode by removing the Electronic-Key.