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The 1764-MM3RTC is a compact, yet powerful, memory and real-time clock module designed for the MicroLogix 1500 series by Allen-Bradley. It offers a robust 16 KB non-volatile memory and a real-time clock (RTC), providing functionality for sophisticated, time-dependent applications such as HVAC systems, where scheduled operations distribute mechanical wear. This module enhances system reliability with independent memory storage, eliminating reliance on power or battery backup to retain data, and features integration with the controller for seamless program execution. With temperature-dependent accuracy and an internal battery, the RTC supports precise schedule management and safeguards the program memory, crucial for avoiding operational disruptions due to power fluctuations.