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Allen Bradley MicroLogix 1500 1764-MM2RTC
Not an Authorized Distributor: DO Supply is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with DO Supply's 2-year warranty.
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1764-MM2RTC

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The Allen-Bradley/Rockwell Automation 1764-MM2RTC memory module is a MicroLogix 1500 series memory module. It is a specialized MicroLogix 1500 memory module that comes with a built-in real-time clock. The 1764-MM2RTC memory module?s capacity is 16K and it can store data and application programs for various MicroLogix 1500 series controllers. The battery that this memory module uses can last for up to 5 years. To extend the life of the 1764-MM2RTC memory module?s battery, the module should be stored at an ambient temperature between -40 and 40 degrees Celsius wherever possible because high temperatures significantly shorten the life of the battery.

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Not an Authorized Distributor: DO Supply is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with DO Supply's 2-year warranty.
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Technical specifications for 1764-MM2RTC

ManufacturerRockwell Automation
BrandAllen-Bradley
Product Family:MicroLogix
FunctionMemory Module with RTC
SeriesMicroLogix 1500
Memory16 Kb
Part Number/Catalog No.1764-MM2RTC
Additional FeaturesReal-Time Clock
Enclosure TypeIP20
Compatible Controllers1764-LSP; 1764-LRP
Output SourceRelay Port and DC FET
Supported Base Units:1764-AWA; 1764-BWA; 1764-BXB
Product Lifecycle Status*Discontinued/Obsolete
Operating Temperature:0-55 deg.C
Support automatic loading:Yes
Clock Accuracy:0°C (+32°F) +34 to -70 seconds/month +25°C (+77°F) +36 to -68 seconds/month +40°C (+104°F) +29 to -75 seconds/month +55°C (+131°F) -133 to -237 seconds/month
Product LifecycleDiscontinued

* The Allen Bradley 1764-MM2RTC has been discontinued by the manufacturer, however we specialize in obsolete parts and can likely still supply surplus and/or refurbished replacement 1764-MM2RTC units instead of migration.

Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

The 1764-MM2RTC is a memory and real-time clock module, designed and manufactured by Allen-Bradley. It belongs to the MicroLogix 1500 series. This unit is fully compatible with MicroLogix 1764-LRP and 1764-LSP controllers. It includes a memory module of 16K and a real-time clock. This memory module is essential when for storing program that requires a large memory. Also, the memory module support backups programs and other functions such as data file download protection, program compare, among others. The 1764-MM2RTC memory/real-time clock module can be inserted or removed at any time without having the risk of damage to the module or the controller. If the module is installed while the controller is in RUN mode, the module will not be recognized until a power cycle occurs or the controller enters in a PROGAM or STOP mode. The function of the Real-time clock is to provide date and time information to the Real-time clock (RTC) function file in the controller. If the module is removed, the controller will write zeros to the RTC Function file. The accuracy of the 1764-MM2RTC varies depending on the temperature. For example, for a temperature of 25 degrees Celsius (77 degrees Fahrenheit) the accuracy will be an approximate of +36 to -68 seconds per month.

The Allen-Bradley 1764-MM2RTC is a MicroLogix 1500 option module. This module is installed to a 1764-LRP or 1764-LSP controller to provide a non-volatile memory and real-time clock capability. The integrated memory of this module amount to 16KB which may be used to store programs, data, recipe, and data logs.

The Real-Time clock capability is an important feature especially in HVAC and BMS systems. Process equipment such as motors and compressors are ideally installed in duplex or triples sets where 1 unit is assigned as active and the other equipment as stand-by. For a triplex configuration, the Third equipment is usually the spare. By linking the user program to a Real-Time clock, equipment mode assignments may be automatically shifted with reference to the calendar and time provided by this module. This ensures that runtime is equally distributed to each equipment. This contributes to proper operation, better maintenance and a more reliable operation.

Real-time clock accuracy is dependent on the stability of the quartz crystal used over the operating temperature. For Temperature range 0°C (+32°F), the accuracy is +34 to -70 seconds/month. For +25°C (+77°F), +36 to -68 seconds/month. For +40°C (+104°F), +29 to -75 seconds/month and +55°C (+131°F), -133 to -237 seconds/month. The integrated 16KB memory on the other hand provides a non-volatile memory that prevents unplanned program and data deletion. This event is typically triggered by voltage and current surges and battery drain. The memory used by the 1764-MM2RTC does not depend on the Lithium battery to retain its memory.

Revision Part #Also known as
1764-MM2RTC Ser A1764-MM2RTC/A, Series A, Rev A
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