6ES7231-5PD32-0XB0 SM 1231 RTD 4-Channel Analog Input Module | Siemens

The Original New Siemens 6ES7231-5PD32-0XB0 SIMATIC S7-1200 SM 1231 RTD Analog Input Module is a 4-channel resistance thermometer input module designed for precise temperature measurement in industrial automation systems. Each channel supports 2‑wire, 3‑wire, or 4‑wire RTD sensors and resistance measurements, with 15‑bit plus sign resolution and configurable temperature units in degrees Celsius or Fahrenheit. Featuring integrated diagnostics including wire break detection and supply voltage monitoring, this module is ideal for multi-point temperature monitoring in HVAC, machine control, and process applications. Fully compatible with all S7‑1200 CPUs (except CPU 1211C).

Core Engineering Highlights:
4 RTD/Resistance input channels | 15-bit + sign resolution | Supports Pt100, Pt1000, Ni100, Ni1000, Cu10, LG‑Ni1000, and more | 2/3/4‑wire connection | 150Ω, 300Ω, 600Ω resistance ranges | 24V DC supply | 40 mA typical current consumption | 80 mA backplane bus current | 1.5 W power loss | Diagnostic alarm and wire break detection | IP20 protection | –20°C to +60°C operating temperature

Key Features:

• Original New Siemens 6ES7231-5PD32-0XB0 module

• 4 analog input channels for resistance temperature detectors (RTDs)

• Supports RTD types: Pt10, Pt50, Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni200, Ni500, Ni1000, Cu10, Cu50, Cu100, LG‑Ni1000

• Supports resistance measurement ranges: 150 Ω, 300 Ω, 600 Ω

• 2‑wire, 3‑wire, and 4‑wire RTD connection

• 15‑bit resolution plus sign for high-precision temperature measurement

• Temperature unit selectable: degrees Celsius or degrees Fahrenheit

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

• Integrated diagnostics: wire break detection, supply voltage monitoring

• Diagnostic alarm function with LED status indication

• 24V DC rated supply voltage, reverse polarity protected

• 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)

• CE, CSA, UL, cULus, FM, RCM, KC approvals

Applications:

• Multi‑zone temperature monitoring with Pt100 / Pt1000 sensors

• HVAC system temperature measurement and control

• Machine bearing and winding temperature detection

• Process temperature control loops

• Resistance measurement for industrial sensors

• OEM equipment requiring high‑precision RTD input expansion

• Retrofit and expansion of existing S7‑1200 systems

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

• 2‑wire, 3‑wire, and 4‑wire RTD sensors

• 24V DC power supply

Typical System Architecture:
24V DC Power Supply
↓
S7‑1200 CPU (e.g., CPU 1214C DC/DC/DC)
↓
6ES7231-5PD32-0XB0 SM 1231 RTD Analog Input Module (4 channels, 45 mm width)
│
├── 4 x RTD Inputs → Pt100 / Pt1000 / Ni100 / Cu10 / LG‑Ni1000 Sensors
├── 2‑wire / 3‑wire / 4‑wire Connection → Flexible Sensor Wiring
├── 15‑bit + sign Resolution → High‑Precision Temperature Measurement
├── Diagnostic Alarms → Wire Break / Supply Voltage Monitoring
│
↓
TIA Portal Engineering (STEP 7 Basic / Professional)
↓
Multi‑Zone Temperature Monitoring and Control Application

Related Products:

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

• 6ES7231-5PF32-0XB0 – SM 1231 RTD (8-channel RTD input module)

• 6ES7231-5PA30-0XB0 – SB 1231 RTD (1-channel RTD signal board)

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

• 6ES7231-5QF32-0XB0 – SM 1231 TC (8-channel thermocouple input module)

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

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

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

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.