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Data Sheet – 6ES7231-5PD32-0XB0

SIMATIC S7-1200, Analog Input SM 1231 RTD
Module Type: 4x AI RTD (Resistance Thermometer)

General Information

• Product type: SM 1231, AI 4x16 bit RTD

• Technical unit: °C / °F (adjustable)

Supply Voltage

• Rated value (DC): 24 V

• Current consumption:

  • Typical: 40 mA

  • From backplane bus 5 V DC: typ. 80 mA

• Power loss: typ. 1.5 W

Analog Inputs

• Number of inputs: 4 (Resistance Thermometer)

• Permissible input voltage: ±35 V

• Input ranges (Resistance Thermometer):

  • Pt types: Pt10, Pt50, Pt100, Pt200, Pt500, Pt1000

  • Ni types: Ni100, Ni120, Ni200, Ni500, Ni1000

  • Cu types: Cu10, Cu50, Cu100

  • LG-Ni1000

• Resistors: 150 Ω, 300 Ω, 600 Ω

• Input resistance examples:

  • Cu10: 10 Ω

  • Pt100: 100 Ω

  • Ni1000: 1,000 Ω

  • Pt500: 500 Ω

• Voltage / Current / Thermocouple: Not supported

Analog Value Generation

• Measurement principle: Integrating

• Resolution (with overrange): 15 bit + sign

• Integration time: Not parameterizable

• Interference voltage suppression: 85 dB at 50 / 60 / 400 Hz

• Repeat accuracy at 25 °C: ±0.05%

• Temperature error: ±0.1% at 25 °C, ±0.2% up to 55 °C

• Common mode interference: min. 120 dB

Diagnostics / Alarms

• Alarms / Diagnostics function: Yes, can be read out

• Monitoring: Supply voltage and wire-break

• LED indicators: Status of inputs, maintenance

Protection / Environment

• IP rating: IP20

• Ambient temperature (operation): -20 °C to 60 °C

• Horizontal installation: -20 °C to 60 °C

• Vertical installation: -20 °C to 50 °C

• Storage / transport temperature: -40 °C to 70 °C

• Air pressure: 795–1080 hPa (operation), 660–1080 hPa (storage)

• Relative humidity: Max. 95% at 25 °C, no condensation

• Pollutant concentrations: SO2 < 0.5 ppm, H2S < 0.1 ppm

Mechanics / Material

• Enclosure material: Plastic

• Dimensions: W 45 mm × H 100 mm × D 75 mm

• Weight: Approx. 220 g 

Technical Details