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The Allen-Bradley 1746-IM4 SLC 500 AC Input Module is designed for efficient integration into the 1746 I/O chassis with four AC inputs handling 200-240V and a frequency range of 47-63 Hz. It features a fast input signal response with a maximum status transmission delay time of 35ms for ON and 45ms for OFF conditions, while maintaining robust circuit isolation tested at 1500V AC between the backplane and the I/O. Operating comfortably within a wide temperature range from 0 to 60 °C and offering excellent noise immunity per NEMA ICS 2-230 standards, this module is UL-A196, CSA, and C-UL certified, making it suitable for use in demanding and hazardous environments.