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The Allen-Bradley 1771-IBDK is a robust, conformally-coated digital DC input module designed for PLC 5 systems, adept at converting DC signals from various user devices into logic levels suitable for processor use. With 16 inputs, it operates within a 10 to 30V DC range, supporting sink (source load) voltage configuration, ensuring reliable performance even in harsh environments thanks to its protective design. Key features include a modular space-saving design, 130mA backplane current load, and convenient I/O addressing capabilities for , 1, and 2-slot configurations, while optoelectrical isolation and input filtering safeguard against electrical transients and noise, complemented by 17 status indicators for operational clarity.