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The Allen-Bradley 1764-RTC is a Real-Time Clock module designed to enhance MicroLogix 1500 controllers by enabling precise scheduling for applications like HVAC and Building Management Systems. It integrates seamlessly with the controller, providing an accurate clock reference accessible via program instructions, with accuracy influenced by operating temperature. The module features a non-replaceable battery with a lifespan of at least five years under standard operating conditions, ensuring reliable performance even when the controller power fluctuates, although data may be lost if both the battery and controller power fail simultaneously.