Allen Bradley 1764-MM1 MicroLogix 1500 Memory Module

Allen Bradley 1764-MM1 MicroLogix 1500 Memory Module

The Allen Bradley 1764-MM1, also cataloged as the 1764-MM1 Memory Module, operates as a dedicated hardware component for firmware backup, real-time data logging, and application program storage within MicroLogix 1500 PLC platforms.

Hardware Specifications

Backplane Communication and Execution Attributes

The Allen Bradley 1764-MM1 module provides non-volatile program backup and recipe storage for MicroLogix 1500 processing units. Engineered to safeguard ladder logic routines during complete electrical outages or primary battery depletion, the module supports automated program retrieval during power-up sequences. The non-volatile flash architecture enforces strict backplane bus communication velocity Licences and memory verification protocols, delivering deterministic logic execution and seamless firmware flash compatibility across connected field networks.

Frequently Asked Questions

Q: Can the 1764-MM1 memory module be installed or removed while the MicroLogix 1500 processor is energized?

A: No, supply power to the base unit must be completely isolated before inserting or removing the memory module to prevent potential memory corruption or electrical component damage.

Q: What is the main functional difference between the 1764-MM1 and the 1764-RTC memory modules?

A: The 1764-MM1 provides 8 KB EEPROM user program and data backup, whereas the 1764-RTC combines memory backup capabilities with an integrated real-time clock circuit.

Field Installation Guidelines

• Isolate 24 VDC or 120/240 VAC power from the MicroLogix 1500 processor base before opening the module access door.

• Touch a bare metal ground point to discharge static electricity before handling the electrostatic-sensitive 1764-MM1 card.

• Align the keying guide on the memory module with the dedicated expansion socket on the front face of the 1764 processor.

• Firmly press the module into the socket until the side latch clips engage with a tactile click.

• Restore power to the controller and verify that status LEDs or RSLogix 500 system properties reflect an active, error-free memory module state.