Siemens 6ES7231-5QD30-0XB0 is a SIMATIC S7-1200 analog input module (SM 1231 TC) with four thermocouple inputs for temperature sensing in automation systems. It supports multiple thermocouple types (J, K, T, E, R, S, N, C) and converts thermocouple millivolt signals to digital values with an input range of ±80 mV. The module operates on 24 V DC and has a typical power consumption around 1.5 W, making it suitable for four‑channel temperature monitoring within SIMATIC S7-1200 projects.
