6ES7231-5QF32-0XB0 SM 1231 TC 8-Channel Thermocouple Input 24V DC | Siemens

The Original New Siemens 6ES7231-5QF32-0XB0 SIMATIC S7-1200 SM 1231 TC Analog Input Module is an 8-channel thermocouple input module designed for high-precision temperature measurement in industrial automation systems. It supports a wide range of thermocouple types including J, K, T, E, R, S, B, N, C, and TXK/TXK(L) with a ±80 mV voltage range. Featuring 15-bit plus sign resolution, configurable smoothing of measured values, and integrated diagnostics including wire break and supply voltage monitoring, this module is ideal for multi-zone temperature monitoring in industrial ovens, furnaces, HVAC, and process applications. The module is housed in a compact 45 x 100 x 75 mm enclosure and is compatible with all S7-1200 CPUs (except CPU 1211C).

Core Engineering Highlights:
8-channel thermocouple input | 15-bit + sign resolution | ±0.1% accuracy at 25°C | Supports J, K, T, E, R, S, B, N, C, TXK thermocouples | ±80 mV voltage range | 24V DC supply | 40 mA typical current consumption | 80 mA backplane current | 1.5 W power loss | Diagnostic alarm and wire break detection | IP20 protection | –20°C to +60°C operating temperature | 45 x 100 x 75 mm

Key Features:

• Original New Siemens 6ES7231-5QF32-0XB0 module

• 8 analog input channels for thermocouple temperature measurement

• Supports thermocouple types: J, K, T, E, R, S, B, N, C, TXK/TXK(L)

• ±80 mV voltage range for low-level analog signal measurement

• 15-bit resolution plus sign (16-bit total)

• High accuracy: ±0.1% at 25°C, ±0.2% up to 55°C

• Configurable smoothing of measured values for stable readings

• 85 dB interference voltage suppression at 50/60/400 Hz

• Common mode interference rejection: ≥120 dB

• Integrated diagnostics: wire break detection, supply voltage monitoring

• Diagnostic alarm function with LED status indication

• Temperature unit selectable: degrees Celsius or degrees Fahrenheit

• 24V DC rated supply voltage

• 40 mA typical current consumption; 80 mA from backplane bus

• 1.5 W typical power loss

• IP20 protection for control cabinet installation

• 45 x 100 x 75 mm compact form factor

• Compatible with all S7-1200 CPUs (except CPU 1211C)

Applications:

• Multi-zone furnace and oven temperature monitoring

• Industrial kiln and heat treatment control

• HVAC system temperature measurement

• Process temperature logging and control

• Machine bearing and winding temperature detection

• Chemical and pharmaceutical process monitoring

• Food and beverage temperature control

• Laboratory and test equipment temperature measurement

Technical Specifications:

Power Supply:

Accuracy & Diagnostics:

Physical & Environmental:

System Compatibility:

• Siemens SIMATIC S7-1200 CPUs (1214C, 1215C, 1217C — all with sufficient I/O capacity)

• TIA Portal V11 or higher

• Thermocouple sensors (J, K, T, E, R, S, B, N, C, TXK)

• 24V DC power supply

Typical System Architecture:
24V DC Power Supply
↓
S7-1200 CPU (e.g., CPU 1214C DC/DC/DC)
↓
6ES7231-5QF32-0XB0 SM 1231 TC Analog Input Module (8 channels)
│
├── 8 x Thermocouple Inputs → J / K / T / E / R / S / B / N / C / TXK Sensors
├── ±80 mV Voltage Range → Low-Level Signal Measurement
├── 16-bit Resolution → High-Precision Temperature Acquisition
├── Diagnostic Alarms → Wire Break / Supply Voltage Monitoring
│
↓
TIA Portal Engineering (STEP 7 Basic / Professional)
↓
Multi-Zone Temperature Monitoring and Control Application

Related Products:

• 6ES7231-5QD32-0XB0 – SM 1231 TC (4-channel thermocouple input module)

• 6ES7231-5PD32-0XB0 – SM 1231 RTD (4-channel RTD input module)

• 6ES7231-5ND32-0XB0 – SM 1231 RTD (4-channel RTD input module, alternative)

• 6ES7214-1AG40-0XB0 – CPU 1214C DC/DC/DC (recommended CPU)

• 6ES7274-1XF30-0XA0 – SIMATIC Memory Card for S7-1200

• 6ES7290-6AA30-0XA0 – Simulation module for S7-1200 (optional)

• 6ES7232-4HD32-0XB0 – SM 1232 Analog Output Module (4AO)

PLC ERA is an independent industrial automation distributor supplying 100% genuine Original New products through established global supply channels. Siemens, SIMATIC, S7-1200, and TIA Portal are trademarks of Siemens AG.