AS-Interface I/O module for the control cabinet
The Siemens 3RK1402-0BG00-0AA2 is an AS-Interface standard slave module in the SlimLine S22.5 design, sized for control-cabinet mounting on 35 mm standard rail or wall mounting using push-in lugs. It provides 2 digital inputs (PNP transistor circuit, 20-30 VDC supply) and 2 digital outputs via relay changeover contacts, floating. The module is addressed through a front addressing socket; ID/ID2 code is 0/F. A built-in watchdog monitors communication, and the AS-Interface green LED confirms bus health. Input voltage range is 20-30 VDC.
What the ratings mean for fit
The 2 inputs are PNP only — ensure your sensors source positive to the module; NPN sensors need an interface. The relay outputs are changeover floating contacts rated 1 A at 24 V, 0.2 A at 110 V, and 0.1 A at 230 V, so they suit signal-level switching or low-power loads, not motor contactor coils directly. The module requires an external 6 A gL/gG backup fuse for short-circuit protection. With IP20 protection, it belongs inside an enclosure, not on the machine frame.
Panel integration and wiring
The module is 22.5 mm wide, 103 mm high, 86 mm deep — fits a standard DIN-rail terminal-block pitch. Wiring uses 2-wire technology with spring-loaded terminals accepting 2 x (0.25-1.5) mm² solid or 2 x (0.25-1) mm² with end sleeve; AWG 24-16 stranded. A detachment tool is listed as an accessory. Operating temperature range is -25 to +70 °C; storage -40 to +85 °C. Status indication: yellow LEDs for I/O states, red LED for fault, green for AS-Interface bus.