Allen Bradley 1756-L55M13 ControlLogix 555 Processor Module

Product Overview

The 1756-L55M13 is a Series A ControlLogix 5555 Controller engineered for high-performance discrete and process control within the Allen-Bradley 1756 chassis system. Featuring 1.5 MB of logic and data memory and an additional 208 KB of dedicated I/O memory, this processor is designed to manage complex automation architectures with up to 128,000 digital I/O points. With a rapid program scan time of 0.08 milliseconds, the 1756-L55M13 provides the processing power necessary for high-speed motion control and synchronized multi-axis applications.

Functional Intelligence & Networking

The 1756-L55M13 acts as a versatile communication hub, supporting a wide array of network protocols including EtherNet/IP, ControlNet, and DeviceNet. It also facilitates legacy integration through Data Highway Plus (DH+) and Universal Remote I/O. For high-speed controller-to-controller synchronization, it utilizes SynchLink, ensuring precise data alignment across distributed systems. While this model does not feature integrated nonvolatile memory, it is fully compatible with redundant controller systems, provided both processors reside within the same ControlNet network to maintain seamless failover state-tracking.

Technical Specifications

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Technical FAQs

How should the memory be managed in the 1756-L55M13?The controller utilizes a split memory architecture: 1.5 MB for data and logic and a separate 208 KB for I/O. Because the 1756-L55M13 lacks internal nonvolatile memory (like an onboard Flash), it is critical to ensure the 1756-BA1 lithium battery is healthy to prevent program loss during power cycles.

What cables are required for programming and configuration?For local serial communication and programming, the module is compatible with either the 1756-CP3 or 1747-CP3 cables. These connect directly to the front-facing RS-232 port, allowing for firmware updates and ladder logic modifications via Studio 5000 or RSLogix 5000 software.

What is the significance of the 707V DC isolation test?The module has been tested to withstand 707V DC for 60 seconds, ensuring high dielectric strength between the communication ports and the backplane. This protects the CPU from potential ground loops or electrical surges originating from field-side communications, which is vital for maintaining system uptime in heavy industrial environments.

Field Engineering & Installation Guide

• Chassis Placement: The 1756-L55M13 can be placed in any slot of a ControlLogix chassis, though Slot 0 is common for primary controllers. Ensure the chassis power supply (e.g., 1756-PA72) can support the 1.23 A current draw at 5V DC.

• Redundancy Setup: When configuring for redundancy, both 1756-L55M13 modules must have identical firmware revisions and be linked via 1756-RM redundancy modules. The "Located in the same ControlNet network" rule is essential for the Nut (Network Update Time) synchronization required for bumpless transfer.

• Environmental Shielding: As an open-style controller, the 1756-L55M13 must be housed in an enclosure that provides protection against conductive contaminants. It is rated for 2 g of vibration at 10-500 Hz, making it suitable for mounting on machinery frames when protected from direct moisture.

Engineering Advantages

The 1756-L55M13 provides a proven, scalable foundation for mid-to-large scale automation. Its ability to handle massive I/O counts while maintaining sub-millisecond scan times makes it a preferred choice for complex assembly lines and material handling systems. For B2B procurement, sourcing an original Allen-Bradley 1756-L55M13 ensures full compliance with UL, CSA, and CE safety standards, providing the reliability and long-term support necessary for critical infrastructure and high-value manufacturing processes.