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The Allen-Bradley 1771-IGC is a robust PLC 5 Digital DC Input Module designed to convert DC signals from external devices into processor-compatible logic levels. This series A module features eight inputs with 5V DC TTL voltage compatibility and offers a swift input signal delay of less than 1ms, ensuring precise communication with TTL and BCD interface encoders. Its modular, space-efficient design includes a 1771-WC wiring arm for seamless module replacement without disconnecting existing wiring, and supports adaptable I/O addressing options. Key features include optoelectrical isolation for enhanced circuit protection against transients, an input filter to minimize electrical noise, and a straightforward keying system for accurate slot placement within a 1771 I/O chassis.