Siemens SIMATIC S7-1200 expansion module 6ES7222-1BH32-0XB0 (SM 1222) provides 16 digital outputs for a SIMATIC S7-1200 CPU, using transistor-output technology to switch 24 V DC loads. Each channel is rated for up to 0.5 A, enabling direct control of devices such as relays, contactors, or indicator lamps. This DO expansion mounts on the S7-1200 backplane bus, increasing the controller's output capacity without a separate controller. It is commonly used in machine automation, packaging lines, and other applications requiring compact, reliable 24 V DC digital control.
