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The Allen-Bradley 1771-IM is a versatile digital AC/DC input module featuring eight inputs, tailored for use with various switches like selector, pushbutton, AC limit, and float switches. It operates with nominal voltages of 240V DC and 220-240V AC at frequencies between 47-63 Hz, with input current specifications reaching up to 3.5 mA for AC applications. The modules effective voltage range spans from 184-276V for both AC and DC applications, offering swift response times with input signal delays of 20 +/- 6 ms for AC and 10 +/- 4 ms for DC transitions. Designed to maintain efficiency, it consumes a backplane current of 75 mA and has a power dissipation of up to 2.4 W, while operating comfortably within a temperature range of 32-140°F and accommodating humidity levels from 5-95% non-condensing.