S7-1200 PLC SIPLUS SM 1231 thermocouple module 6AG1231-5QD32-4XB0

SIEMENS SIPLUS S7-1200 SM 1231 TC with conformal coating based on 6ES7231-5QD32-0XB0 . Analog input, 4 AI thermocouples

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Order No.: 6AG1231-5QD32-4XB0 6AG12315QD324XB0 SIPLUS S7-1200 SM 1231 TC with conformal coating based on 6ES7231-5QD32-0XB0 . Analog input, 4 AI thermocouples6AG12315QD324XB0_datasheet_en


  • For the convenient recording of temperatures with great accuracy
  • 7 common thermocouple types can be used
  • Also for the measurement of analog signals with a low level (±80 mV)
  • Can easily be retrofitted to existing plant

SIPLUS extreme products are based on SIMATIC standard products. The contents listed here were taken from the respective standard products. SIPLUS extreme specific information was added.



The SM 1231 thermocouple modules enable temperatures to be measured with high precision using established thermocouples. In addition, low level analog signals in the ±80 mV range can be recorded. The SM 1231 thermocouple modules can be used with the CPUs of the S7-1200 series.



The SM 1231 thermocouple modules exhibit the same structural features as the other modules of the S7-1200 series:

  • Mounting on a DIN rail: 
    The modules are snapped onto the rail just to the right of the CPU and connected to one another and with the CPU 12xx by means of the integral backplane bus.
  • Direct mounting: 
    Drilled holes permit the module to be bolted directly to walls. This type of mounting is recommended for applications subject to strong vibrations.
  • Thermocouples: 
    Four thermocouples each of types J, K, T, E, R, S and N can be used. They are connected directly to the module without amplifiers.
  • Mounting location: 
    For maximum possible measurement and repeat accuracy, the thermocouple modules should be mounted in locations with low temperature variations.



Different measurement ranges: 
Thermocouples of types J, K, T, E, R, S and N; analog signal recording ±80 mV.

Check for open lines.

Compensation of the cold connecting point: 
Faults caused by contact voltages at the connection between thermocouple and module are prevented; when recording analog signals (±80 mV), the compensation is automatically deactivated.

Temperature scaling: 
The measured temperature can be shown in °C or °F.

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