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Allen Bradley PLC
MicroLogix 1500
1764-MM3RTC

1764-MM3RTC

Urgent Automation is NOT an authorized distributor for this manufacturer and therefore the manufacturer’s warranty does not apply.

Product comes with Urgent Automation's 1-year warranty.

Rated 4.7 with 6 reviews
Products Specifications

Rockwell Disclaimer: The product is used surplus. Urgent Automation 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 Urgent Automation 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, Urgent Automation 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. Urgent Automation 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. Urgent Automation also makes no representations as to your right to install any such firmware on the product. Urgent Automation 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.


1764-MM3RTC

Description: The 1764-MM3RTC is a MicroLogix component is a combined component consisting of a memory module and a Real-Time Clock (RTC).

Urgent Automation is NOT an authorized distributor for this manufacturer and therefore the manufacturer’s warranty does not apply.

Product comes with Urgent Automation's 1-year warranty.


Description: The 1764-MM3RTC is a MicroLogix component is a combined component consisting of a memory module and a Real-Time Clock (RTC).
Products Specs



Rated 4.7 with 6 reviews






About 1764-MM3RTC

The 1764-MM3RTC is a memory module and a real-time clock combination component that belongs to the bulletin 1764 series MicroLogix Controller family. This component is a passive component made by Allen-Bradley. The Allen-Bradley 1764-MM3RTC memory module and real-time clock memory module has 16 Kilobytes memory. The 1764-MM3RTC provides an accurate time-base for all the controller functions that require a real-time reference and coordination of events. Typical applications that require this feature are HVAC and BMS applications where equipment scheduling is necessary. This module provides the year, month, day of month, day of week, hour, minute. The memory of the Allen-Bradley 1764-MM3RTC stores programs and data, transports programs to be used with other controllers, provides security for critical applications, compares programs, and offers data file and memory module protection. One way to utilize Real-time clock and Memory storage is by embedding timestamps on data files stored in the memory module area. The 1764-MM3RTC basically has no difference with the 1764-MM2RTC. The exception is that the 1764-MM3RTC can store data from the Data Log Queue area. 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. Additionally, the Real-Time Clock can be configured via the Data Access Tool (DAT), if one is installed in the MicroLogix controller. The MM3RTC support removal under power. When doing so, the component will require a power cycle for the controller to recognize the component again. Practice caution in this step as the power cycle itself may require process stoppage.

Technical specifications:


Manufacturer: Rockwell Automation
Brand: Allen-Bradley
Product Family: MicroLogix
Product Type: Memory Module / Real-Time clock
Part Number: 1764-MM31RTC
Supported CPU:1764-LSP; 1764-LRP
Supported Base Units: 1764-AWA; 1764-BWA; 1764-BXB
Memory Size:16 Kbytes
Operating Temperature:0-55 deg.C
Support automatic loading: Yes
Support for removal under power:Yes
Bit control:S:1/11 "Load Memory Module Always
Status bits:S:1/10, S:1/11, S:1/12
Manufacturer: Rockwell Automation
Brand: Allen-Bradley
Product Family: MicroLogix
Product Type: Memory Module / Real-Time clock
Part Number: 1764-MM31RTC
Supported CPU:1764-LSP; 1764-LRP
Supported Base Units: 1764-AWA; 1764-BWA; 1764-BXB
Memory Size:16 Kbytes
Operating Temperature:0-55 deg.C
Support automatic loading: Yes
Support for removal under power:Yes
Bit control:S:1/11 "Load Memory Module Always
Status bits:S:1/10, S:1/11, S:1/12
Common misspellings:
  • l764-MM3RTC
  • 176A-MM3RTC
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