Allen-Bradley 1756-L55M12 ControlLogix Processor Module

Product Overview

The Allen-Bradley 1756-L55M12 is a high-performance processor module belonging to the industry-leading ControlLogix platform. This Logix5555 controller acts as the central brain for large-scale, complex automation systems, executing sophisticated control logic with exceptional speed and precision. It manages extensive I/O networks and coordinates multi-axis motion control, making it indispensable for advanced manufacturing and process industries. We supply this product as 100% Brand New and in original packaging, guaranteeing genuine factory specifications for mission-critical system integrations.

Technical Specifications

Engineering Advantages

Scalable Architecture for Massive I/O Control
The 1756-L55M12 delivers immense processing power to handle the largest automation architectures. With the ability to address up to 128,000 digital I/O points and 6,000 analog channels, this processor seamlessly scales from single-machine control to entire plant-wide systems. Its 750KB of user memory accommodates highly complex ladder logic, structured text, and function block diagrams without compromising execution speed.

High-Speed Execution for Deterministic Control
Featuring a blazing-fast program scan time of just 0.08 milliseconds, this controller ensures deterministic performance for time-critical applications. It executes control loops, motion coordination, and safety logic with minimal latency. This speed is vital for high-speed packaging lines, synchronized assembly operations, and complex chemical process control where split-second timing directly impacts product quality and safety.

Flexible Chassis Integration and Redundancy
You can install the 1756-L55M12 in any slot of a ControlLogix chassis, providing complete layout flexibility. The processor communicates seamlessly over the backplane with other modules and supports multi-processor configurations within a single chassis. Furthermore, it supports redundant system architectures, allowing you to pair controllers for hot-swappable failover, which maximizes system uptime and protects against unplanned production stoppages.

FAQs

Q: How much memory does this processor have for user logic?
A: The 1756-L55M12 is equipped with 750 Kilobytes of RAM dedicated to user logic, tags, and application data. This capacity supports extensive and complex control programs required for large-scale automation projects.

Q: What is the maximum number of I/O points this controller can manage?
A: This processor can address a maximum of 128,000 digital I/O points. For analog signals, it supports up to 4,000 input channels and 2,000 output channels, providing massive scalability for distributed control systems.

Q: Does this processor require a battery to maintain memory?
A: Yes. To retain user programs, configuration data, and tag values during power loss, the 1756-L55M12 requires a compatible battery. You should use either the Allen-Bradley 1756-BA1 or the 1756-BATM battery module.

Q: How fast does the processor execute control logic?
A: The 1756-L55M12 boasts a highly responsive program scan time of 0.08 milliseconds. This ensures rapid data processing and near-instantaneous reaction to field changes, which is essential for high-speed and precision automation tasks.