3RK3121-2AC00 SIEMENS

The SIRIUS 3RK3121-2AC00 is a central unit from the ASIsafe Basic series, designed for modular safety systems. It serves as the core component for monitoring AS-Interface (AS-i) slaves and controlling safe outputs within a safety-related application. This unit features 1/2F-DI (one or two fault-safe digital inputs), 6 standard digital inputs, 1F-RO (one fault-safe relay output), and 1F-DO (one fault-safe digital output), all operating on a 24V DC power supply. It allows for the monitoring of AS-i slaves, ensuring the safe operation of connected devices. The 3RK3121-2AC00 controls 8 safe outputs on the AS-i bus, providing a comprehensive safety solution. Parameterization is achieved through the MSS ES software, enabling customization to specific application requirements. With a compact width of 45mm and spring-loaded terminals, installation and wiring are simplified. This central unit achieves up to SIL3 (Safety Integrity Level 3) according to IEC 61508 and up to Performance Level E according to ISO 13849-1, ensuring a high level of safety. Note that no expansion modules can be connected to this basic unit.