Module D · Configuration and Selection Profile
Siemens 6ES7231-5QD32-0XB0 SIMATIC S7-1200 Thermocouple Input Module
A four-channel, 16-bit thermocouple analog input signal module for the SIMATIC S7-1200 controller system.
Model-specific snapshot for procurement and engineering
A four-channel, 16-bit thermocouple analog input signal module for the SIMATIC S7-1200 controller system.
The technical scope below is limited to the complete article number 6ES7231-5QD32-0XB0.
SM 1231 four-channel thermocouple order code
| Manufacturer | Siemens |
|---|---|
| Article number | 6ES7231-5QD32-0XB0 |
| Product type | SM 1231, AI 4 × 16 bit TC |
| Analog inputs | 4 thermocouple inputs |
| Rated supply voltage | 24 V DC |
| Typical current consumption | 40 mA |
| Backplane bus current, 5 V DC | 80 mA typical |
| Typical power loss | 1.5 W |
| Thermocouple types | B, C, E, J, K, N, R, S, T, TXK/XK(L) |
Integrated conversion for thermocouple and millivolt signals
Four thermocouple channels
The module provides four analog inputs for thermocouple measurement.
Thermocouple selection
Supported types are B, C, E, J, K, N, R, S, T and TXK/XK(L) according to the model-specific data sheet.
Voltage input mode
The module accepts a rated voltage range of -80 to +80 mV with an input resistance of at least 1 MΩ.
Temperature units
The engineering unit can be set to degrees Celsius or degrees Fahrenheit.
Front connector, channel wiring and compensation planning
A front connector is required.
Configure each channel for an officially supported thermocouple type or the ±80 mV range.
This order code does not provide current, resistance thermometer or resistance input ranges.
Choose for four thermocouple channels in an S7-1200 station
Select this module when the application requires up to four supported thermocouple inputs or low-level ±80 mV measurement. Use a different S7-1200 signal module for RTD, resistance or current inputs.
| Voltage input range | -80 to +80 mV |
|---|---|
| Input resistance at ±80 mV | ≥1 MΩ |
| Maximum permissible input voltage | ±35 V |
| Temperature unit | Degrees Celsius or degrees Fahrenheit |
| Required front connector | Yes |
| Operating temperature | -20 to +60 °C |
| Dimensions (W × H × D) | 45 × 100 × 75 mm |
| Approximate technical weight | 0.18 kg |
Manufacturer lifecycle status for this order code
Siemens lists the module as active, with product phase-out scheduled to begin on 1 November 2026.
Selection questions about 6ES7231-5QD32-0XB0
What is Siemens 6ES7231-5QD32-0XB0?
It is a SIMATIC S7-1200 SM 1231 analog input module with four 16-bit thermocouple channels.
Which thermocouple types are supported?
The model-specific data lists B, C, E, J, K, N, R, S, T and TXK/XK(L).
Can the module measure RTDs or resistance?
No. The official data marks resistance thermometer and resistance input ranges as unavailable for this model.
What voltage range is available?
The module supports -80 to +80 mV with an input resistance of at least 1 MΩ.
What are the official dimensions and approximate weight?
The dimensions are 45 × 100 × 75 mm and the technical data lists an approximate weight of 180 g.
Contact Information
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