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The Allen-Bradley 1771-IQC is a versatile digital input module from the PLC 5 series, engineered to handle DC input voltage ranging from 5 to 30 Volts DC across eight selectable input points. Known for seamlessly converting DC signals to processor-compatible logic levels, this module is highly compatible with a wide range of input devices, including proximity switches and selector switches. Designed for enhanced reliability, it features input filtering to mitigate voltage transients and boasts opto-electrical isolation to safeguard logic and backplane circuits from electrical disturbances. Compatible with both current and superseded chassis, such as the 1771-A1B and 1771-A4, and supporting slot, 1-slot, and 2-slot addressing, the 1771-IQC ensures flexible integration without specific module placement requirements.