PLC Controller Memory Modules | Allen-Bradley 1756-M13

The Allen-Bradley 1756-M13 is a 1.5 MB non-volatile expansion memory module designed specifically for first-generation ControlLogix controllers, primarily matching the 1756-L55 (Logix5555) architecture. Installed directly into the controller's internal expansion slot, it doubles memory capacity over standard configurations to accommodate extensive program logic, large data tag structures, and complex sequential or motion control routines.

System Integration and Compatibility

The module provides 1.5 MB of dedicated program and data storage. When attached to the host processor board, it forms complete controller assemblies such as the 1756-L55M13.

The 1756-M13 maintains compatibility across the entire 1756-L55 controller family, including base units combined with other memory expansion variants (such as 1756-L55M12, 1756-L55M14, 1756-L55M16, 1756-L55M22, 1756-L55M23, and 1756-L55M24). This modular daughtercard design allows system integrators to upgrade application storage without replacing the main processing unit hardware.

Physical Characteristics and Electrical Design

Designed to seat internally within the main controller enclosure, the module receives operational power directly through the host controller's internal connection. It operates within a standard industrial temperature range of 0 to 60 deg C (32 to 140 deg F) and a non-condensing relative humidity range of 5% to 95%. The unit features an ultra-compact form factor with a total weight of approximately 0.018 kg (0.04 lbs).

Technical Specifications

Frequently Asked Questions

Q: What is the main application of the 1756-M13 memory expansion module? A: The 1756-M13 provides 1.5 MB of expanded non-volatile memory for Allen-Bradley ControlLogix 1756-L55 (Logix5555) controllers, allowing the system to store larger control logic programs and tag databases.

Q: Is the 1756-M13 installed directly into a 1756 ControlLogix chassis slot? A: No, the 1756-M13 is an internal daughtercard board that plugs directly into the host 1756-L55 processor circuit board inside the controller enclosure.