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The Allen-Bradley 1771-IG Digital DC Input Module is designed for efficient integration into PLC 5 systems, converting user-provided DC signals to appropriate logic levels with an input delay of less than 1 ms. This series A module supports , 1, and 2-slot I/O addressing, offering eight 5V DC TTL-compatible inputs, and is ideal for TTL and BCD interface applications. The module features a space-saving, modular design utilizing a 1771-WC wiring arm for convenient replacement without disconnecting wiring, while providing optoelectrical isolation and input filtering to prevent electrical transients and reduce noise, ensuring reliable performance in a 1771 I/O chassis configuration.