Siemens 6ES7322-1HH01-0AA0 Digital Output Module

The Siemens 6ES7322-1HH01-0AA0 is a SIMATIC S7-300 digital output module (SM 322) that provides 16 optically isolated relay outputs for AC loads. It uses a single 20‑pole front connector and is designed to plug into an S7-300 backplane, enabling discrete control of field devices while maintaining electrical isolation from the controller. Each of the 16 outputs is a relay contact rated for AC operation at 120/230 V and can switch up to 2 A per channel, making it suitable for energizing relays, contactors, lamps, and other actuators in industrial automation. The module’s isolation between the backplane and each output enhances noise immunity and protects the PLC in harsh environments. This 6ES7322-1HH01-0AA0 variant is a standard SM 322 option for expanding digital output capability within SIMATIC S7-300 systems and is commonly referenced in Siemens data sheets and Industry Mall listings for tasks requiring reliable, isolated 16‑channel relay control.