Allen-Bradley 1764-MM1RTC Real Time Clock Memory Module is an 8K memory expansion for MicroLogix 1500 controllers that combines a memory module with a built-in real-time clock. It provides an 8K memory area and a battery-backed RTC, enabling time-stamped data storage in the MicroLogix 1500's MMI file and extending memory for program and data logging. Designed for MicroLogix 1500 systems, the RTC is supported by Rockwell's documentation, which notes typical battery life of about five years under normal storage and operating conditions (-40°C to +40°C).
