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The Allen-Bradley 1756-L64 is a robust ControlLogix standard controller, featuring 16 MB of user memory and 478 KB of I/O memory, with support for an optional 128 MB CompactFlash memory card for non-volatile storage. It accommodates up to 250 controller connections and provides extensive communication capabilities including EtherNet/IP, Data Highway Plus, ControlNet, and more, with serial port options like DH-485 and Modbus. This controller, compatible with various ControlLogix chassis, supports a comprehensive array of I/O with a maximum capacity of 128,000 digital and 4,000 analog points, and features redundant control support, a user-replaceable battery, and rigorous environmental resistances, ensuring optimal performance across a wide temperature range.