The Allen-Bradley 1747-L20B SLC 500 Fixed Controller Processor provides an optional two-slot expansion chassis, and a 5-yr lifespan lithium battery assembly-backed RAM with 2wks capacitor length, with options for EEPROM or UVPROM backup memory. The processor can be mounted onto a back panel via mounting tabs and #12 or #10 screws, and is not equipped with a high-speed counter.
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