Siemens 6ES7231-5PD32-0XB0 S7-1200 SM 1231 RTD 4xAI

Siemens SIMATIC S7-1200 SM 1231 analog input module provides 4 channels for resistance temperature detector (RTD) sensors. Supports Pt100, Pt1000, Ni100, Ni1000, and other RTD types. Ideal for multi-point temperature measurement in HVAC, machine control, and process applications. High resolution for precise temperature acquisition.

Applications:

• Multi-zone temperature monitoring with RTD sensors

• HVAC system temperature measurement

• Machine bearing and winding temperature detection

• Process temperature control loops

• Retrofit and expansion of existing S7-1200 systems

Technical Specifications:

• Number of inputs: 4 analog inputs (RTD)

• Supported sensor types: Pt100, Pt1000, Ni100, Ni1000, Cu10 (2-wire, 3-wire, 4-wire)

• Measuring range: -200°C to +850°C (depending on sensor)

• Resolution: 15 bits + sign (temperature), 15 bits (resistance)

• Conversion time: Approx. 100 ms per channel

• Measurement principle: Sigma-delta converter

• Diagnostics: Wire break detection (for 3-wire and 4-wire)

• Isolation: No isolation between channels (group isolated from backplane)

• Supply voltage: 24V DC from backplane bus

• Power loss: Approx. 2.0 W typical

• Dimensions (approx.): 45 mm x 100 mm x 75 mm

• Weight: Approx. 200 g

Compatibility:

• SIMATIC S7-1200 CPUs (1214C, 1215C, 1217C)

• TIA Portal V11 or higher

Related Products:

• 6ES7231-5ND32-0XB0 – SM 1231 RTD (4 x RTD, older variant)

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

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

For fewer channels or space-constrained applications, consider the signal board version.

Product Status:
Active product. Supports 2-, 3- or 4-wire RTD connection per channel.

PLC ERA is an independent industrial automation distributor. Products are sourced through established supply channels and inspected prior to shipment. International shipping available.