Siemens AG 6ES7-322-1HH00-0AA0 Interface Module

Siemens SIMATIC S7-300 SM322 digital output module with 16 relay contacts (model 6ES7-322-1HH00-0AA0) provides sixteen relay outputs for direct control of field devices from an S7-300/300F PLC. Each of the 16 relay contacts can switch up to 2 A, with load ratings listed as 24 V DC/2 A or 120 V AC/2 A, enabling connections to actuators, indicators, or other loads via external power sources. The module mounts on the standard SIMATIC backplane and is configured as an SM322 DO16xRel slot in the hardware configuration, communicating via the backplane I/O data path and offering PLC diagnostic reporting through the CPU. This 16-relay variant of the SM322 family is commonly used in SIMATIC installations and PCS 7 contexts where discrete relay outputs are required, providing mechanical relay switching for applications that demand simple on/off control of multiple devices.