The Allen-Bradley 1747-L20A SLC 500 Fixed Controller Processor provides a 5-yr lifespan lithium battery assembly-backed RAM with 2wks capacitor length, with options for EEPROM or UVPROM backup memory. The controller does not include a high-speed counter. It can be mounted to a panel and supports two slot I/O expansion racks. An optional battery backup may be installed, retaining RAM memory contents longer.
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