The PNOZ s5 unit features Positive-guided relay outputs with 2 safety contacts (N/O), instantaneous and 2 safety contacts (N/O) (delay-on de-energisation), connection options for E-STOP pushbuttons, safety gate limit switches, start buttons and light grids and safety switches with detection of shorts across contacts. Operating modes and delay times can be selected via rotary switches and the circuit is redundant with built-in self-monitoring. The safety function remains effective in the case of a component failure and the correct opening and closing of the safety function relays is tested automatically in each on-off cycle.