Siemens, SIPLUS S7-1200, 6AG2231-5PD32-1XB0, 0 DO, 0 DI, 0 AO, 4 AI, Single-phase, 24 V DC.

The Siemens SIPLUS S7-1200 SM 1231 RAIL RTD analog input expansion module (model number 6AG2231-5PD32-1XB0) features 4 analog inputs (AI) specialized for resistance temperature detectors (RTD), with 0 digital outputs (DO), 0 digital inputs (DI), and 0 analog outputs (AO). Derived from the standard 6ES7231-5PD32-0XB0 baseline hardware design, it processes high-precision thermal diagnostics using a 15-bit plus sign resolution across Pt100, Pt1000, and Ni1000 sensor tracks. Operating within a single-phase architecture powered by a standard 24 V DC voltage supply, this specialized module features a robust protective conformal coating and holds EN 50155 certification for railway infrastructure installations, ensuring reliable telemetry performance under severe vibration, shock, and extreme thermal conditions.