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The Allen Bradley 1747-L20D is an SLC 500 Fixed Hardware Style PLC module that combines a power supply and a fixed number of I/O in one compact unit. It features capacitor-backed RAM memory with a processing power of 1K instructions, operating at 47 to 63 Hertz. Equipped with 12 24V DC sink inputs, 8 AC triac outputs, and a high-speed counter, it offers robust operational flexibility. Designed for durability, it operates efficiently in temperatures from 0 to 60 degrees Celsius and relative humidity up to 95% non-condensing. Its compact dimensions and lightweight design, coupled with a typical scan time of 8 milliseconds per 1K instructions and a 50 VA power requirement, make it ideal for efficient, space-constrained applications.