Allen Bradley 1756-L55 ControlLogix Logix5555 Processor

Overview

The Allen Bradley 1756-L55 is a ControlLogix Logix5555 processor module designed for high-performance industrial automation control. It functions as the central processing unit of a ControlLogix system, managing logic execution, I/O coordination, and communication across multiple devices. The controller is widely used in complex automation environments requiring reliable real-time performance and system scalability.

General Information

Part Number: 1756-L55

Manufacturer: Allen Bradley

Brand: Allen-Bradley

Country of Origin: United States

Series: ControlLogix

Type: Logix5555 Processor / Controller

Module Category: Programmable Automation Controller (PAC)

Processor Family: Logix5555

Mounting: ControlLogix Chassis Installation

Memory Capacity: System-dependent user memory

Supported I/O: ControlLogix I/O modules via backplane

Power Specifications

Input Power: 5 V DC via ControlLogix backplane

Backplane Current Draw (5.1 V DC): Approx. 1.0 A

Backplane Current Draw (24 V DC): Minimal auxiliary consumption

Power Dissipation: Approx. 5–7 W

Battery Backup: Supported for memory retention

Isolation Voltage: System-level chassis isolation

Status Indicators: RUN, OK, Fault, and communication LEDs

Communication & Interface

Backplane Communication: High-speed ControlLogix bus

Programming Interface: RSLogix / Studio 5000 compatible environment

Network Support: Modular communication via communication modules

I/O Handling: Real-time deterministic control of distributed I/O

Diagnostics: Module-level fault and system status monitoring

Task Execution: Multitasking real-time control execution

Environmental

Operating Temperature: 0°C to +60°C

Storage Temperature: -40°C to +85°C

Relative Humidity: 5% to 95% RH, Non-Condensing

Shock Resistance: Industrial Grade

Vibration Resistance: Suitable for control cabinet installation

Protection Rating: Installed within protected enclosure

Dimensions & Weight

Dimensions (H × W × D): 145.2 × 34.6 × 139.6 mm

Weight: 0.34 kg

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