6ES7231-5PF32-0XB0 is an 8-channel analog input module for Siemens SIMATIC S7-1200 controllers, marketed as the SM 1231 RTD signal module with eight RTD inputs (8xAI RTD).
It extends the SIMATIC S7-1200 I/O with RTD inputs for temperature sensing in industrial process control, supporting eight RTD channels on a single module. The device is listed as IP20 and designed for 24V DC operation, and Siemens markets it under the SM 1231 RTD family as a PM300-active product.
