Module role and key ratings
The 6ES7228-1RC52-0AA0 is a Siemens SIMATIC EMS400S PSB-S safety module providing six digital inputs at 24 V DC, one synchronized DI for encoder or pulse trains, and three 48 V DC rail-signal interfaces for track-side or conveyor safety loops. It operates from -40 °C to 70 °C with IP20 ingress protection, suiting cabinet-mounted use in cold-storage, outdoor shelters, and process areas with controlled environments. The 24 V DC supply accepts 20.4 V to 28.8 V, and the module carries cULus and CE marks for panel compliance.