Wishlist Quick view SIEMENS Siemens Digital Input SM 1221, 8DI, 24V DC 6ES7221-1BF32-0XB0 €140.00 Digital Input SM 1221, 8DI, 24V DC SIMATIC S7-1200, Digital input SM 1221, 8 DI, 24 V DC, Sink/Source Datasheet: Download PDF Add to Wishlist