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The Allen-Bradley 1771-IN is a versatile PLC5 Digital AC input module featuring 8 inputs with an AC operating voltage range of 12-28V. Designed for seamless integration with existing Allen-Bradley programmable controllers, this module interfaces efficiently with On/Off devices such as pushbuttons and motor starters, aided by electrical-optical isolations and filter circuits that simplify troubleshooting. Highlighted by its power-efficient design, the unit draws a maximum of 80mA backplane current and features status indicator lights for easy monitoring of input/output conditions, alongside a fault mode selection option that allows for quick configuration recovery in the event of an output failure.