Siemens 6ES7231-5QF50-0XB0 SIMATIC S7-1200 SM 1231 TC 8x Thermocouple 15-Bit PLC I/O Module

Siemens 6ES7231-5QF50-0XB0 is a SIMATIC S7-1200 SM 1231 TC analog input module with 8 thermocouple channels supporting types J, K, T, E, R, S, B, N, C, and TXK/XK(L), 15-bit-plus-sign resolution, and a 24 V DC backplane supply. It plugs directly into the S7-1200 rack for distributed multi-point temperature measurement.

Technical Specifications

Certifications & Standards

• CE
• UL
• cULus
• RCM
• KC

Selection Notes

Eight independent thermocouple channels with 15-bit plus sign resolution suit multi-zone temperature monitoring where the installed sensors are already thermocouples rather than RTDs; the SM 1231 TC and RTD variants are not interchangeable, so sensor type on hand should drive the selection. A temperature error band of +/-0.1% across -20C to 60C and 120 dB common-mode rejection support noisy plant environments, though the 100 m shielded cable-length limit rules this module out for very long sensor runs without local signal conditioning.

Applications

Furnace and oven zone temperature monitoring, extruder barrel temperature loops, and multi-point process temperature logging on S7-1200-based automation stations.