Siemens 6ES7231-5QD32-0XB0 SIMATIC S7-1200 SM 1231 TC 4 AI Thermocouple Module

The Siemens 6ES7231-5QD32-0XB0 is a SIMATIC S7-1200 SM 1231 TC module with 4 thermocouple input channels supporting Types B, C, E, J, K, N, R, S, T, and TXK/TXK(L), each resolving to 15 bit plus sign. It draws 40 mA typical and dissipates 1.5 W, with wire-break diagnostics and ±0.1% accuracy at 25°C across the total measurement range.

Technical Specifications

Certifications & Standards

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

Selection Notes

With 4 channels against the SB 1231 TC signal board's single channel, the SM 1231 TC suits multi-zone temperature monitoring -- a 4-zone oven or extruder barrel, for example -- from one module instead of stacking signal boards across several CPUs. It also supports the full thermocouple type range (B, C, E, J, K, N, R, S, T, TXK/TXK(L)), so mixed sensor types on the same machine can share one module rather than needing type-specific hardware. As a rack-mounted SM rather than a CPU signal board, it needs a free signal-module slot and a wider footprint (45 x 100 x 75 mm) -- confirm rack space before specifying it on a 1212C, which supports fewer signal modules than the 1214C/1215C.

Applications

Multi-zone oven or furnace temperature monitoring, extruder barrel zone control, or any S7-1200 station needing 4 or more thermocouple channels of mixed sensor type.