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1756-L55 Allen-Bradley ControlLogix 5555 Processor Module

1756-L55 Allen-Bradley ControlLogix 5555 Processor Module

Technical Overview

The 1756-L55 is a chassis-based programmable automation controller from the Logix5555 family within the ControlLogix platform. It serves as the primary execution engine for discrete, process, motion, and coordinated control applications.

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Vendor: Allen Bradley
Category: Processor Module
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Technical Overview

The 1756-L55 is a chassis-based programmable automation controller from the Logix5555 family within the ControlLogix platform. It serves as the primary execution engine for discrete, process, motion, and coordinated control applications.

Unlike later Logix controllers, the 1756-L55 does not contain onboard user memory and requires a compatible 1756-M1/M2/M3/M4 memory expansion module for operation. The controller supports multitasking execution with configurable task priorities, enabling deterministic performance in complex automation environments.

Key Specifications

Parameter Specification
Model 1756-L55
Controller Family Logix5555
Operating Temperature 0°C to +60°C
Weight 0.35 kg

 

Functional Capabilities

  • Discrete and analog process control

  • Integrated motion (with SERCOS or EtherNet/IP modules)

  • Multitasking with configurable priorities

  • Peer-to-peer controller communication

  • Deterministic scan performance

Typical Applications

  • Automotive assembly systems

  • Water and wastewater treatment

  • Material handling systems

  • Packaging lines

  • Coordinated motion systems

Frequently Asked Questions

Why does the controller show a memory fault at startup?
The 1756-L55 requires a 1756-M series memory module. Without it, the controller cannot load or execute user programs.

What is the purpose of the 1756-BA1 battery?
It maintains SRAM memory when chassis power is removed. If the BATT LED turns red, replace the battery while the rack is powered to prevent data loss.

Does this processor support motion control?
Yes. Motion is supported through SERCOS, EtherNet/IP, or analog motion modules installed in the chassis.