Product Overview

The 1756-L55M23 is a specialized high-performance CPU within the Allen-Bradley ControlLogix 5555 series. This module is engineered to provide advanced computational power for complex industrial automation environments. Featuring a unique dual-processor architecture, it effectively splits processing duties: one dedicated CPU manages application logic and message execution, while a secondary backplane CPU handles high-speed data exchange with I/O modules and network interfaces.

This controller is equipped with 1.5 megabytes of user memory for logic and data storage, supplemented by 208 kilobytes of dedicated I/O memory. To ensure industrial-grade reliability, the 1756-L55M23 includes integrated non-volatile memory backup, protecting critical code against power fluctuations and extended downtime.

Technical Characteristics

• Memory Capacity: 1.5 MB Logic/Data Memory and 208 KB I/O Memory.

• Dual-CPU Design: Separate processors for logic execution and backplane communication to maximize throughput.

• Multitasking Capabilities: Supports up to 32 independent tasks, including one high-priority periodic task for deterministic control.

• Protocol Support: Seamlessly integrates with EtherNet/IP, ControlNet, DeviceNet, DH+, and Remote I/O through chassis-mounted communication modules.

• Data Sharing: Native support for Produced/Consumed tags, allowing real-time data synchronization between multiple Logix controllers across a network.

• Diagnostics: Integrated hardware fault handler and visual LED indicators (including a dedicated I/O status light) for rapid troubleshooting.

• Battery Backup: Compatible with 1756-BA1 or 1756-BATM battery assemblies for volatile memory retention.

• Isolation Voltage: 30V continuous; tested to withstand 707V DC for 60 seconds.

• Power Consumption: Draws 1.23 A at 5.1V DC and 0.014 A at 24V DC from the backplane.

• Dimentions: 3.5 x 14 x 14.5 cm

• Weight: 0.36 kg.

Application and System Integration

The 1756-L55M23 is optimized for high-demand applications such as precision material handling, food and beverage processing, and complex assembly lines. By utilizing the Logix5000 instruction set, it provides a unified programming environment for discrete, motion, and process control.

Its ability to execute high-level tasks simultaneously ensures that time-critical operations are never delayed by background communication processes. Furthermore, the 1756-L55M23 supports online editing and advanced fault diagnostics, allowing engineers to modify or troubleshoot the system without stopping production. The module fits into any slot of a standard 1756 ControlLogix chassis, offering a scalable solution that grows with your facility’s automation requirements.