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The Allen Bradley SLC 500 Digital Combination I/O Module 1746-IO4 is engineered to efficiently manage two inputs and two outputs with a versatile voltage range. It supports 120 Volts AC for inputs and maintains a consistent range of 100 to 120 Volts AC for relay contact outputs, ensuring reliable operation within 85 to 132 Volts AC at 47 to 63 Hertz. This module handles a continuous current of 4 A and features minimal backplane current consumption, capable of both AC and DC operations, with a robust operating temperature range from -25 to 60 degrees Celsius. Designed to withstand harsh conditions, it offers a relative humidity tolerance between 5% and 95% without condensation and maintains stability under operational vibration and shock with its dependable self-lifting lift plate terminals catered to industrial standards.