The 30SLC0100-N04 series safety grating adopts CPU self-test, and the four level grating has passed the European CE safety certification (EN61496-1/2) and the American FCC safety grating professional certification; When there is a malfunction (such as unsynchronized light source, insufficient light source intensity, power circuit error in the projection drive, main control circuit error, cable problem, as well as receiving drive circuit error, main control circuit error, CPU error), the light curtain can ensure that no error signal is sent to the controlled equipment, ensuring the safety of the product; In order to pursue better safety in output, dual independent OSSD output is adopted, which provides high safety for automatic fault prevention and can directly drive relays and safety PLCs; When the 3.30SLC0100-N04 series safety light grid malfunctions, specific digital tubes and indicator lights are used to inform users of the location and cause of the light curtain malfunction, in order to facilitate better maintenance;