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The Allen-Bradley 1747-L40B is a robust fixed hardware controller designed for industrial applications, operating within a voltage range of 85-265V AC at 47-63 Hz, and designed to handle input configurations of 24 at 120V AC and output configurations of 16 AC Triac. It features a 1K instruction capacity, a capacitor-backed RAM with optional EEPROM or UVPROM memory backup, and provides excellent electrical-optical isolation at 1500V AC for one minute. With a swift typical scan time of 8 milliseconds per K and the ability to hold program scan data for 20-700 milliseconds post-power loss, it maintains reliable performance between ambient temperatures of 32-140°F and can be stored between -40-85°C.