Wishlist Quick view SIEMENS Siemens SM 1221 Digital Input , 16DI 6ES7221-1BH50-0XB0 €219.00 SM 1221 Digital Input , 16DI SIMATIC S7-1200 G2: SM 1221 digital input, 16 DI; inputs: 16x DI 24 V DC sink/source Datasheet: Download PDF Add to Wishlist