Siemens 6ES7231-5QA30-0XB0 Thermocouple Input Module

Siemens 6ES7231-5QA30-0XB0 is the SB 1231 thermocouple input module for the SIMATIC S7-1200 system, delivering a single analog input dedicated to thermocouples. It provides 1 AI thermocouple channel that accepts a wide range of thermocouple types, including J, K, T, E, R & S, B, N, C, TXK/XK(L), with an input range of -80 mV to +80 mV and a 16‑bit resolution for precise temperature measurements. The thermocouple signal is complemented by configurable temperature compensation, and readings can be displayed in Celsius or Fahrenheit to suit different process needs. Designed to plug into the S7-1200 via the SB 1231 signal board, it is powered from the system’s 24 V DC supply, aligning with standard industrial automation power practices. Applications include single-point temperature sensing in heating and cooling loops, process monitoring, and basic temperature control tasks where direct PLC integration with an S7-1200 is advantageous. The module’s compact, plug‑in thermocouple input board format simplifies integration on rooms or panels with limited space, enabling straightforward wiring for thermocouple sensors and reliable data capture for control, logging, or alarming within an automation project.