1756-L55M22 Allen Bradley

Original price was: $2,522.00.Current price is: $1,940.00.

1 in stock



Manufacturer Rockwell Automation
Brand Allen-Bradley
Part Number/Catalog No. 1756-L55M22
Series ControlLogix
Module Type Processor Module
RAM 750 Kilobytes
Nonvolatile Memory 750 Kilobytes
Maximum I-O 128,000
Maximum Analog I-O 4,000 Input, 2,000 Output

The Allen Bradley 1756-L55M22 is a ControlLogix processor module used in Rockwell Automation’s ControlLogix series of programmable automation controllers (PACs). This module is designed to provide high-performance processing capabilities for complex industrial automation applications, offering advanced features, extensive memory, and robust communication options.

Key Features:

  • Processor Capabilities:
    • CPU: The 1756-L55M22 is equipped with a powerful CPU that can handle complex control algorithms, large I/O counts, and extensive data processing tasks.
    • Memory: It includes 2 MB of user memory, allowing for large and sophisticated control programs. This ample memory supports extensive logic, data handling, and communication tasks.
  • Communication Ports:
    • Communication Options: The module supports multiple communication options, including ControlNet, DeviceNet, and Ethernet/IP, facilitating integration with a wide range of industrial devices and systems.
    • Backplane Communication: High-speed backplane communication ensures efficient data transfer between the processor and I/O modules.
  • I/O Capabilities:
    • I/O Expansion: The 1756-L55M22 can interface with a variety of I/O modules, enabling customization of the control system to meet specific application requirements.
    • Distributed I/O: Supports distributed I/O configurations, enhancing system flexibility and scalability.
  • Advanced Programming:
    • Programming Software: Uses Rockwell Automation’s RSLogix 5000 (now Studio 5000) software for programming. This software offers a user-friendly environment and powerful tools for creating, debugging, and managing complex control programs.
    • Instruction Set: Provides an extensive instruction set, including advanced math, data handling, motion control, and PID control functions.
  • Diagnostics and Monitoring:
    • LED Indicators: Features LED indicators for power, run, fault, force, and communication status, aiding in quick diagnostics.
    • Advanced Diagnostics: Provides detailed diagnostic information to monitor system health, performance, and to troubleshoot issues.


  • Complex Process Control:
    • Suitable for complex process control applications in industries such as chemical processing, pharmaceuticals, and food and beverage production, where precise control and extensive data handling are required.
  • Manufacturing Automation:
    • Used to automate sophisticated machinery, production lines, and manufacturing processes, ensuring high efficiency and reliability.
  • Motion Control:
    • Ideal for applications involving advanced motion control, such as robotics, CNC machines, and material handling systems.
  • Building Automation:
    • Integrates with building management systems for controlling HVAC, lighting, security, and other systems, especially in large and complex buildings.


  • High Performance:
    • The powerful processor and ample memory enable handling of complex and demanding control tasks with high efficiency.
  • Flexible Communication:
    • Multiple communication options and support for various network protocols provide seamless integration with a wide range of industrial devices and systems.
  • Scalability:
    • The ability to expand with additional I/O modules and support for distributed I/O configurations allows for scalable system design.
  • User-Friendly Programming:
    • RSLogix 5000/Studio 5000 software simplifies the programming process, offering intuitive tools and extensive functionality for developing and managing control programs.

Installation and Configuration:

  • Physical Installation:
    • Typically mounted in a ControlLogix chassis. Proper installation ensures stable operation and easy access for maintenance.
  • Wiring:
    • Connects to I/O devices via standard wiring methods. Proper cable management helps maintain system reliability and performance.
  • Network Setup:
    • Configure network settings and communication parameters using the programming software to ensure seamless integration with other networked devices and systems.

Maintenance and Support:

  • Diagnostics:
    • Regular monitoring and diagnostics help detect and address issues before they impact system performance. The module provides detailed status information to aid in troubleshooting.
  • Firmware Updates:
    • Periodic firmware updates may be required to improve performance, add new features, or fix known issues. These updates can be applied without significant downtime.
  • Technical Support:
    • Rockwell Automation offers extensive support resources, including documentation, online forums, and technical assistance, to help users troubleshoot and optimize their systems.