The Siemens SM322 digital relay output module (order 6ES7322-1HF01-0AA0) provides eight isolated relay contacts for the SIMATIC S7-300 PLC system. Each of the eight outputs is rated for 2 A per channel and supports loads up to 230 V AC or 24 V DC, with channel isolation to improve fault tolerance; it uses a single 20‑pole backplane interface and is intended for use in a dedicated S7-300 rack slot. This module is ideal for switching field devices such as solenoids, relays, and similar actuators, enabling reliable control from the S7-300 CPU without mixing relay and semiconductor outputs.
