Allen-Bradley 1756-L55A ControlLogix 5555 Controller Module

SKU 1756-L55A

In stock

12-month warranty
Free returns within 30 days

Manufacturer: Allen-Bradley
Product No.: 1756-L55A
Country of origin:United States
Product Type: Programmable Logic Controller
Payment: T/T, Western Union
Weight: 1000g
Shipping port: Xiamen
Warranty: 12 months

Overview

The Allen-Bradley 1756-L55A is a ControlLogix 5555 controller for the 1756 chassis platform.

The recorded configuration includes a front RS-232 port, a separately specified nonvolatile memory module, and a 1756-BA1 battery.

Features

Part of the scalable Allen-Bradley ControlLogix 5555 controller family
Supports multi-tasking execution for continuous, periodic, and event tasks
Includes the 1756-BA1 lithium battery for volatile memory backup
Features integrated RS-232 serial communication interface for terminal access and controller configuration
Compatible with standard 1756 ControlLogix chassis power supplies and backplanes

Technical Specifications

Parameter	Specification
Manufacturer	Allen-Bradley / Rockwell Automation
Product Type	ControlLogix 5555 Controller Module
Catalog Number	1756-L55A
Product Family	ControlLogix (Series 1756)
Communication Ports	RS-232 serial port
Required Memory Module	Sold separately (ControlLogix non-volatile memory card)
Included Accessories	1756-BA1 lithium battery
Isolation Voltage	30V (continuous), basic isolation type, RS-232 to system
Conducted RF Immunity	10V rms with 1kHz sine-wave 80% AM from 150kHz to 80MHz (IEC 61000-4-6)
Wiring Category	2 on communications ports
North American Temperature Code	T4A
IEC Temperature Code	T4
Country of Origin	United States

Connections / Interfaces

The 1756-L55A controller features a front-accessible RS-232 serial communication port. This interface supports direct connection using standard programming cables such as the 1756-CP3 or 1747-CP3 for initial configuration, firmware updates, and local device troubleshooting. Controller communication across the 1756 backplane supports bridging to EtherNet/IP, ControlNet, and DeviceNet networking modules.

FAQ

What chassis and power supplies are compatible with the Allen-Bradley 1756-L55A?

The Allen-Bradley 1756-L55A ControlLogix 5555 Controller Module is engineered to operate seamlessly within any standard 1756 ControlLogix chassis and backplane architecture. It relies on standard 1756 chassis power supplies to deliver stable operational power across the shared backplane. Installers must ensure the power is off before sliding the module into any available slot and securing it with the integrated latching mechanisms.

Does the Allen-Bradley 1756-L55A include onboard memory for user projects?

The Allen-Bradley 1756-L55A ControlLogix 5555 Controller Module requires a separately purchased non-volatile memory card to store user projects and data execution files. However, it does include the 1756-BA1 lithium battery for volatile memory backup during standard power cycles. Proper installation of both the memory card and the battery is essential for maintaining complete operational data integrity.

What communication interfaces are available on the Allen-Bradley 1756-L55A?

The Allen-Bradley 1756-L55A ControlLogix 5555 Controller Module features a front-accessible RS-232 serial communication port designed for terminal access, firmware updates, and initial controller configuration. This serial interface supports direct connection using cables such as the 1756-CP3. Additionally, the controller supports backplane bridging to external EtherNet/IP, ControlNet, and DeviceNet networking modules.

What task execution types does the Allen-Bradley 1756-L55A support?

The Allen-Bradley 1756-L55A ControlLogix 5555 Controller Module supports advanced multi-tasking execution environments for demanding industrial applications. It is capable of handling continuous, periodic, and event-driven tasks to coordinate complex discrete and process control strategies. This robust processing engine ensures reliable execution across high-speed manufacturing lines and continuous process environments.

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Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

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For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

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