Siemens 6ES7231-5QF32-0XB0 SIMATIC S7-1200 SM 1231 TC 8AI Thermocouple PLC I/O Module

Siemens 6ES7231-5QF32-0XB0 is a SIMATIC S7-1200 SM 1231 analog input module with 8 thermocouple channels, 15-bit plus sign resolution, and support for 10 thermocouple types (J, K, T, E, R, S, B, N, C, TXK/TXK(L)). It runs from a 24 V DC supply, draws 40 mA typical, and adds diagnostic wire-break and supply-voltage monitoring per channel.

Technical Specifications

Certifications & Standards

• CE
• CSA
• UL
• cULus
• FM
• RCM
• KC
• Marine

Selection Notes

The 8-channel TC variant covers ten thermocouple types on one module, so a single SM 1231 TC can serve mixed-sensor applications - K-type on one channel, J-type on another - without separate voltage-input modules. 15-bit plus sign resolution and built-in wire-break diagnostics per channel matter where a broken thermocouple lead must be flagged rather than silently read as a stuck value. If the application only needs standard voltage or current-loop sensors, the SM 1231 voltage/current variant is the simpler, less expensive choice.

Applications

Used for temperature monitoring and closed-loop control on S7-1200 stations - ovens, extruders, kilns, and process heating skids - where multiple thermocouple types are already installed across sensors.