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The Allen-Bradley 1756-M24 is a memory expansion module designed for ControlLogix5555 controllers, featuring 3.5 Megabytes of nonvolatile memory which allows it to retain project data even without power. Designed for use within an open type enclosure in a ControlLogix chassis, this A-series module is equipped with an LED indicator to confirm successful installation. It offers robust compatibility across multiple controllers and works seamlessly with a controllers battery module to maintain data integrity as long as the controller remains in place, operating efficiently within a temperature range of 0 to 60 degrees Celsius.