Allen-Bradley 1756-L81EXT ControlLogix-XT 3MB Ethernet Controller

Manufacturer: Allen-Bradley
Product No.: 1756-L81EXT
Condition： In stock
Product Type: Ethernet Controller
Product Origin: USA
Payment: T/T, Western Union
Weight: 420g
Shipping port: Xiamen
Warranty: 12 months

Quantity

Selected quantity: 1

Estimate delivery times: 12-26 days (International), 3-6 days (United States).

Return within 30 days of purchase. Duties & taxes are non-refundable.

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Allen-Bradley 1756-L81EXT ControlLogix-XT Controller Overview

The 1756-L81EXT serves as a high-performance processor within the ControlLogix-XT series. Engineers utilize this module for mission-critical automation in extreme environments. It features a rugged conformal coating to resist corrosion and humidity. This controller operates seamlessly between -25°C and 70°C. We recommend downloading the official technical manual and user datasheet for precise wiring diagrams. High-demand applications benefit from its superior thermal dissipation and integrated communication ports.

Technical Specifications

Brand: Allen-Bradley / Rockwell Automation
Model: 1756-L81EXT
Series: ControlLogix-XT
User Memory: 3 MB
Communication: 1 USB Port and 1 Embedded Ethernet Port
Controller Tasks: 32 Tasks
Programs Per Task: 1000 Programs
Current Draw (1.2V DC): 5 mA
Current Draw (5.1V DC): 1.2 A
Thermal Dissipation: 21.2 BTU/hour
Temperature Range: -25°C to 70°C (Standalone)
Environmental Resistance: Conformal Coating for harsh chemical protection
Interference Immunity: High electromagnetic compatibility (EMC) for industrial noise
Programming: Ladder Logic, Structured Text, Function Block, and SFC

Installation and Compatibility

Chassis Compatibility: Install the 1756-L81EXT in standard or XT chassis.
Upgrading: Operators using LXT chassis should upgrade to the K version.
I/O Support: The module supports unlimited local I/O event triggers for rapid response.
Network Integration: It works with EtherNet/IP, DeviceNet, and ControlNet protocols.
Flex I/O Integration: Pair with Flex I/O-XT for consistent -20°C to 70°C ratings.

Global PLC Spare HUB's Insight

The 1756-L81EXT represents a significant leap for hardened automation. Unlike standard controllers, the EXT designation ensures hardware longevity in salt-spray atmospheres. The 3 MB memory handles substantial logic code without sacrificing processing speed. We find the embedded Ethernet port simplifies architecture by removing extra bridge modules. This unit fits perfectly in outdoor control panels or non-climate-controlled floors.

Application and Diagnostics

Typical Scenarios: Oil and Gas, Mining, Water Treatment, and Power Generation.
Diagnostic Ability: Integrated scrolling display provides real-time status and fault codes.
Reliability: Redundant path communication ensures continuous operation during network strain.

Shipping and Warranty

Dispatch Time: We ship all orders within 24-48 hours.
Carrier Options: Worldwide delivery via FedEx, UPS, and DHL.
Warranty Terms: This product includes a 12-month warranty.
Package List: One 1756-L81EXT Controller and original protective industrial packaging.

Frequently Asked Questions (FAQ)

Does the 1756-L81EXT require a battery for memory backup?

No, this model utilizes energy storage modules to eliminate the need for lithium batteries.

What is the benefit of the conformal coating on this specific module?

The coating prevents dendrite growth and leakage currents caused by tropical humidity.

Can I use standard 1756 I/O modules with this XT controller?

Yes, but the system temperature rating will drop to the lowest-rated component limit.

How do I choose between the 1756-L81EXT and the standard 1756-L81?

Select the EXT version if your cabinet temperature exceeds 60°C regularly.

Purchasing Guide

Verify your chassis series to ensure physical fitment and power supply overhead.
Confirm your firmware revision requirements before integration into existing plants.
Check the environmental specs of your enclosure to utilize the XT range.
Contact our technical team for bulk quantity discounts or expedited logistics.

PDF

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Q: Are these parts 100% original and new?

A: Yes. Every component is guaranteed to be 100% original, brand-new, and factory-sealed. We also provide a 12-month comprehensive warranty for your peace of mind.

Q: How fast is the shipping to my country?

A: For in-stock items, we offer same-day dispatch. International express shipping (DHL/FedEx/UPS) typically delivers within 3–5 business days worldwide.

Q: Can I get a formal quotation with shipping costs?

A: Absolutely. Our sales team is ready to provide a detailed Proforma Invoice (PI) including the most competitive shipping rates for your location.

Q: Do you offer discounts for bulk orders?

A: We provide volume-based pricing for large projects or multiple-item orders. Please contact us to get our Best Price Guarantee.

12-Month Comprehensive Warranty

Every part supplied by Global PLC Spare Hub is covered by a 12-month warranty from the date of invoice.

Coverage: Functional defects and hardware failures under normal operating conditions.
Commitment: We provide immediate repair, replacement, or a full refund for any verified defective components to minimize your operational downtime.

Returns & Exchange Policy

We offer a 30-day return policy to ensure you receive the exact part your system requires.

Eligibility: Returns are accepted for uninstalled items in their original, factory-sealed packaging.
RMA Process: Please contact our support team to obtain a Return Merchandise Authorization (RMA) number before shipping.
Fast Processing: Refunds or exchanges are processed within 3–5 business days after the returned item passes our technical inspection.

Need Technical Assistance?Not sure if this part is compatible with your system? [Consult our Engineers] before purchasing to ensure 100% compatibility.