SIMATIC S7-1200 SM 1231 RTD signal module

The SM 1231 RTD analog signal module measures the resistance value connected to the module input. This value can be either temperature or resistance.

● If it is a resistor, the full scale value of the rated range will be the decimal number 27648.

If it is temperature, multiply the number of degrees by 10 to get the value (for example, 25.3 degrees will be reported as the decimal number 253).

The SM 1231 RTD module supports 2-wire, 3-wire, and 4-wire connections to the sensor resistance for measurement.

Model SM 1231 AI 4 x RTD x 16-bit Order Number (MLFB) 6ES7 231-5PD30-0XB0 Dimensions W x H x D (mm) 45 x 100 x 75 Weight 220 g Power consumption 1.5 W Current consumption (SM Bus) 80 mA Current consumption (24 VDC) 1 40 mA Number of inputs 4 types

Temperature Resistance 0.1° C/0.1° F 15-bit plus sign bit Max withstand voltage ± 35 V Noise suppression For selected filter Settings (10 Hz, 50 Hz, 60 Hz, and 400 Hz) 85 dB Impedance ≥ 10 MΩ Isolation field side and logical side Field side and 24 VDC 24 VDC and logical side channels and channels 500 VAC 500 VAC 500 VAC None Accuracy See RTD Sensor Selection Table Repeatability ± 0.05% FS Maximum sensor power consumption 0.5m W Measurement Principle Integral module Update time See Filter selection table Cable length (m) to sensor maximum 100 m Wire resistance maximum 20 Ω, for 10 Ω RTD, Max. 2.7Ω common mode suppression > 120dB Diagnostic overflow/Underflow alarm 2 3 Support disconnection alarm 4 Support 24 VDC low voltage alarm 2 Support 1 20.4 to 28.8 VDC (Class 2 restricted power supply, or sensor power supply provided by CPU module)

2 Overflow, underflow, and low voltage diagnostic alarms are reported as analog data values, even if they are disabled in the module configuration. 3 Range underflow detection is always disabled for resistors.

4 If the wire break alarm is disabled, but the sensor wiring is open, the module may report a random value.

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