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The Allen-Bradley 1747-L20N is a compact PLC module that integrates a power supply with a fixed I/O configuration, designed for efficient performance and ease of use. With an instruction capacity of 1024 (1K) and operating at a frequency range of 47-63 Hz, it features a high-speed counter capable of processing up to 8 kHz, which can be utilized through input 0 with a selectable jumper filter. It runs on 24V DC and supports a DC Transistor Sink output, with input specifications of 10-30V DC On-state voltage, 4-5V DC Off-state voltage, and a nominal current output of 20 mA for input 0 or 8 mA for other inputs, ensuring quick response times of up to 8 milliseconds for both turn-on and turn-off operations.