Overview
The Allen-Bradley 1756-M13/A is a memory expansion module designed for the ControlLogix 5555 Programmable Automation Controller (PAC) platform from Rockwell Automation. This module directly addresses memory constraints in industrial automation systems by adding 1.5 megabytes of non-volatile storage capacity. It integrates seamlessly into the 1756 backplane architecture, enabling engineers to deploy larger, more data-intensive control logic without controller replacement.
Key Features
- Non-volatile memory: Retains program data and critical state information when power is lost, ensuring system integrity across restart cycles.
- Hot-swappable design: Can be installed or removed without powering down the ControlLogix controller, minimizing production downtime during maintenance or upgrades.
- Compatible with major ControlLogix 5555 processors: Works with L55, L55M12, L55M13, L55M14, L55M16, L55M22, L55M23, and L55M24 controller models.
- Regulatory compliance: Meets CE, C-UL, and UL safety standards for use in North American and European industrial environments.
- Robust environmental tolerance: Rated for 0–60°C operating temperatures and 5–95% non-condensing humidity; mechanical shock resistance of 30 G during operation and 50 G at rest.
Technical Specifications
The module is designed for direct installation into the 1756 ControlLogix chassis memory slot. Key performance metrics include electrostatic discharge (ESD) immunity of 6 kV for indirect contact and 8 kV for air discharge per IEC 61000-4-2 standards. Operating current draw is minimal, reducing overall backplane load. It operates at emissions class Group 1, Class A and supports mechanical vibration up to 2 G at 10–500 Hz. Power and battery disconnection is required prior to installation for safety compliance.
Typical Applications
- Complex manufacturing automation: Expanding controller capacity for advanced sequencing, data logging, and multi-axis motion control in automotive, pharmaceutical, and food-processing environments.
- Process control and data-intensive applications: Supporting batch records, historical trending, and advanced diagnostics in oil/gas, utilities, and chemical plants.
- System upgrades: Cost-effective memory expansion for existing ControlLogix installations without full controller replacement.
- Distributed control systems: Enabling decentralized logic execution with extended program storage in large industrial facilities.
Compatibility & Replacements
The Allen-Bradley 1756-M13/A is the “/A” revision of the standard 1756-M13 memory module and maintains full backward compatibility with ControlLogix 5555 systems. It works alongside other 1756 modules—communication cards (EtherNet/IP, ControlNet), digital/analog I/O, and control modules—within the same chassis. When memory needs exceed 1.5 MB, users may consider the larger 1756-M3 (2 MB capacity). Current firmware and proper backplane configuration are recommended for optimal performance. Ensure incoming and battery power are disconnected before installation to prevent damage.
