Siemens 6ES7231-4HD32-0XB0 SIMATIC S7-1200 Analog Input SM 1231
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SIMATIC S7-1200, Analog input, SM 1231, 4 AI, +/-10 V, +/-5 V, +/-2.5 V, or 0-20 mA/4-20 mA, 12 bit+sign (13 bit ADC)
