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The Allen-Bradley 1747-L20F is a fixed hardware PLC controller from the SLC 500 Series designed for versatile industrial applications. It integrates a 1K instruction capacity processor, a power supply, and 20 I/Os, featuring twelve 24VDC inputs and eight AC/DC relay outputs. The controller can expand its I/Os to 64 using an expansion chassis, employs capacitor-backed RAM with optional EEPROM and UVPROM memory backup, and operates on 120-240V AC line power with a 24V DC user power output. It provides reliable performance with a typical scan time of 8 milliseconds per 1K, supports wire size up to #14 AWG, and offers high-level I/O electrical-optical isolation at 1500V AC. The 1747-L20F is suitable for environments with temperatures ranging from 0 to 60°C and includes robust power fuse protection, ensuring durability in demanding settings.