1764-MM3RTC

The 1764-MM3RTC is a MicroLogix 1500 Memory Module with the Real-Time Clock (RTC) function. This memory module is manufactured by Allen Bradley/Rockwell Automation for the 1500LRP MicroLogix controller that allows for backup of programs and also confers data downloads as well as memory protection to enhance safety. Allen Bradley 1764-MM3RTC comes with a 16 kilobytes maximum memory size and has the real-time clock (RTC) functionality that provides the date and time information to the 1500LRP MicroLogix controller function file. This real-time clock features a temperature dependent accuracy range of 34 to -70 seconds per month at 0 degrees Celsius or 32 degrees Fahrenheit through -133 to -237 seconds per month accuracy at a temperature of 55 degrees Celsius or 131 degrees Fahrenheit. The real-time clock function features an internal battery that helps to provide backups for the time-stamped data in storage, and also features a battery with minimum lifespan of 5 year when used at a temperature range of 0 – 40 degrees Celsius or 32 – 104 degrees Fahrenheit. Allen Bradley 1764-MM3RTC memory module is capable of storing only one user program at a time, but it also provides application memory security since it helps prevents the controller from execution in case the memory module program is not compatible with the one on the controller. The 1764-MM3RTC memory module supports the “write once” and “read many” function; besides, it sturdily built and remains undamaged when removed from the controller at any time. The memory module has a working temperature ranging from 0 – 55 degrees Celsius or 32 – 131 degrees Fahrenheit at non-condensing relative humidity of 5 to 95 percent. It is built to be stored at a temperature ranging from -40 to 85 ° degrees Celsius or -40 to 185 degrees Fahrenheit.

1764-MM3RTC is a MicroLogix 1500 16 Kilobytes Memory Module with Real-Time Clock designed and manufactured by Allen-Bradley. Real-time clock modules provide a temporal foundation for controller operations that must be synchronized with real-time events. Using the RTC function file, they supply the controller with information such as the year, month, day of the month, day of the week, hour, minute, and second. This dual-component module is placed in any MicroLogix 1500 base unit's memory module slot. This memory module is also capable of preserving data from the Data Log Queue area, making it a cost-effective option. The memory module in this module has a memory size of 16KB non-volatile memory. It is an EEPROM type that is capable of retaining data without the need for a battery, unlike the controller's internal battery. In actual operation, the controller reads the internal memory area provided by the processor. If a memory module is present, the contents of the memory module are copied to the internal memory during each power cycle. The contents of the internal memory are preserved by a lithium battery with the appropriate replacement part number of 1746-BA, which functions only when the base unit or controller assembly is powered off. When power is applied, the internal memory contents are retained by the external power supply. When both the external power supply and the battery's voltage are gone, the internal memory loses its contents, causing erasure of the program. Recipe data that were stored in the Data Log Queue are in the MicroLogix 1500 LRP can be stored in the 1764-MM3RTC modules. There is no difference in functionality between the 1764-MM2RTC and 1764-MM3RTC modules, except the 1764-MM3RTC modules can save recipe data from the Data Log Queue.