Siemens 6AG1221-1BF32-4XB0 Digital Input Module. The recorded exact-product description states: SIPLUS S7-1200 SM 1221 8DI based on 6ES7221-1BF32-0XB0 with conformal coating, -20…+60 °C, digital input 8 DI, 24 V DC, sink/source.
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