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The Allen-Bradley 1771-INGA50 is a discrete I/O backplane interface module designed for the 1771 series, featuring 16 inputs with an operational voltage range of 24 Volts DC/AC. It supports AC voltage operations between 16 to 30 Volts AC and DC between 9 to 30 Volts DC, with a backplane current of 250 mA. The module, which requires rack mounting, is suitable for industrial environments with pollution degree 2 ratings and can handle Category 2 over-voltage levels; signal delays for AC are typically 35 milliseconds ON and 45 milliseconds OFF, while DC signal delays are 45 milliseconds ON and 50 milliseconds OFF. For optimal performance, ensure proper installation practices to manage ambient temperature and prevent electrostatic discharge.