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The Allen-Bradley 1771-IK module is a versatile counter and encoder unit designed for integration with PLC-5 systems, featuring dual-channel encoder support and a single-channel counter with a peak input pulse rate of 50 kilohertz. It accommodates both block transfer and single transfer modes, necessitating an external DC power supply of 12 to 24 volts and handling input current demands of up to 170 milliamps, with output ratings of 500 milliamps per collector. Engineered for robust performance, it operates within a thermal dissipation of 41.3 BTU per hour and supports backplane currents of up to 1.4 amps, fitting seamlessly into an Allen-Bradley 1771 chassis for demanding industrial environments.