is a specific digital output (DO) module in the SIMATIC S7-300 series, featuring eight electrically isolated relay outputs designed for switching both AC and DC loads in industrial environments
This SM 322 module serves as a critical interface between the PLC’s control logic and external actuators such as contactors, motor starters, and solenoid valves. Unlike solid-state modules, its relay-based outputs provide versatile voltage compatibility (24 V DC to 120 V DC and 24 V AC to 230 V AC) and galvanic isolation, making it suitable for a wide range of industrial applications with mixed voltage requirements.
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