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Allen-Bradley 1756-L81E ControlLogix – Ready to Ship / Pick Up

In stock: The 1756-L81E is a 3 MB ControlLogix 5580 controller, embedded 1 Gb EtherNet/IP port. NJT Automation has 6 units available in Milwaukee, WI, ready to ship or available for local pickup. Includes a one-year full-function warranty.

Allen-Bradley 1756-L81E ControlLogix 5580 controller, 3 MB – front view

$2,499.99 – $3,499.99USD

Request Repair QuoteEstimated $1,440.00
DescriptionControlLogix 5580 controller, 3 MB. In stock in refurbished and unused surplus condition, Series B.
ShippingShips today UPS Ground included | Next-Day Air and Worldwide Shipping available at checkout
PickupFree local pickup at 2122 N Prospect Ave. Call ahead at (414) 331-5954.
Warranty1-year full-function warranty provided by NJT Automation.
Warranty details

The original Allen-Bradley warranty does not apply to pre-owned units. Full warranty coverage is provided directly by NJT Automation. If you have any issues we can usually swap your unit next-day air (based on inventory)-no waiting weeks for a repair.

Included: 1 Year
+1 Year: +15% of product price (from $375.00)
+2 Years: +25% of product price (from $625.00)
View Full Warranty Policy
Returns90-day free returns on all purchases.View return policy
Exchange

Send us your defective 1756-L81E after your purchase for a 10% core credit. We also purchase old or damaged parts outright.

Replacement Options for 1756-L81E

In stock and ready to ship today

Allen Bradley 1756-L81E Ser B ControlLogix 5580 Controller 3MB Memory 1756L81E

In-Stock Match

$2,499.99 USD

Condition: Refurbished

Series B

1 in stock

View Product
Availability
Multiple Options Available
Variants
Part NumberConditionSeriesQtyPrice
1756-L81E /BRefurbishedSeries B1$2,499.99 USD1756-L81E /BUnused surplus (new old stock)Series B3$2,949.99 USD1756-L81ES /BUnused surplus (new old stock)Series B2$3,499.99 USD1756-L81E /CRefurbishedSeries CRequest Quote
Repairs

1756-L81E Mail-In Repair Service

Estimated: $1,440.00

Part Number Decoder

ControlLogix 5580 controller
1756L81E

3 MB ControlLogix 5580 controller, embedded 1 Gb EtherNet/IP port.

1756
BulletinControlLogix: Rockwell Automation's chassis-based control platform (controllers, I/O, communication modules, power supplies and chassis).
L
Module typeLogix controller (CPU module).
8
GenerationControlLogix 5580: Logix5580 series (embedded 1 Gb EtherNet/IP port, 5–20x the performance of 5570).
1
Memory size3 MB of standard user memory.
E
Embedded portEmbedded EtherNet/IP port (1 Gb) on the controller front, so no separate bridge module is required for the first network.
Decoded from the Rockwell Automation catalog-number structure. Series and firmware revision are printed on the product label, not encoded here.

Similar Part Numbers

  • 1756-L82E Memory size: 5 MB of standard user memory
  • 1756-L83E Memory size: 10 MB of standard user memory
  • 1756-L84E Memory size: 20 MB of standard user memory

Allen Bradley Information

Technical Description
Allen Bradley (Rockwell Automation) 1756 E03 - 1756-L81E
Lifecycle: Active — verify current status with the manufacturer

Alternate Part Numbers

1756L81E
CategoryControlLogix
UPC / GTIN887172361326
Part Number1756-L81E
ManufacturerAllen-Bradley

Can the 1756-L81E be repaired?

Yes. NJT Automation offers mail-in repair for the 1756-L81E, including diagnostic evaluation, component-level repair, and functional testing.

NJT Managed Repair

One vendor. One warranty. NJT manages the entire process.

  • 1-year full-function NJT warranty, with 2- and 3-year options available
  • Rush service available for production-critical repairs
  • No evaluation or diagnostic charges
  • No repair, no charge
  • Pre-paid UPS shipping label provided for sending your unit in
  • $650 minimum repair charge, shipping included both ways
Get an NJT Repair Quote

Looking for another option? For lower-cost repairs or if you prefer to work directly with an independent repair specialist, compare bids through RepairMode. RepairMode providers operate independently and set their own pricing and warranty terms.

See completed 1756-L81E repairson RepairMode.com ↗

Common 1756-L81E failures

Failure patterns we regularly see on ControlLogix 5580 controller hardware like the 1756-L81E:

  • Controller will not boot or shows a solid red OK LED (nonrecoverable major fault) after a power event
  • SD card corruption: controller reports a load failure or comes up with no project
  • Front USB and 1-Gb Ethernet port failures from ESD or a damaged connector
  • Four-character status display stuck, blank or showing scrolling fault text
  • Overheating in a full chassis, especially with no spacing in sealed enclosures
  • Repeated major faults after a firmware flash that did not complete

Documented failure modes

Commonly reported issues for the Allen-Bradley 1756-L81E include Energy storage fault, based on recent completed repairs. These are compiled from customer issue descriptions and technician repair notes. A technician confirms the actual root cause of each unit during evaluation.

Why Choose Our Repair Service?

  • ■ Rush turnaround available, with 24-hour emergency service on some models
  • ■ 1-year full-function warranty, with 2- and 3-year extended options
  • ■ No evaluation or diagnostic charges
  • ■ Free UPS shipping label available
  • ■ "Unrepairable" is not an option
  • ■ Thousands of successful Allen-Bradley restorations

Request a Repair Quote

Ready to repair your 1756-L81E? Request a repair quote below. For immediate assistance, text photos of your faulty unit and a description of the symptoms to (414) 331-5954.

Start Your Repair Today

Still have questions?

Find answers to shipping, warranties, repairs, and more.

The Allen-Bradley 1756-L81E is a 3 MB ControlLogix 5580 controller, embedded 1 Gb EtherNet/IP port.
The 1756-L81E is available in Unused surplus / Refurbished / Used condition. We can quote this part in unused surplus, refurbished, or used condition depending on availability and your preference. Specify your requirement in the RFQ.
We have 1756-L81E units in stock in Milwaukee, WI. Orders placed before 5:00 PM Central on business days ship the same day; orders placed after the cutoff ship the next business day.
Yes. UPS Next Day Air is available at checkout for the 1756-L81E. Place your order before 5:00 PM Central on a business day and your in-stock item ships the same day for next-business-day delivery.
Yes. Free local pickup is available for in-stock 1756-L81E units at NJT Automation, 2122 N Prospect Ave, Milwaukee, WI, during business hours. Contact us to arrange a pickup time.
3 MB of standard user memory.
1756-L81E breaks down as: 1756 = ControlLogix; L = Logix controller (CPU module); 8 = ControlLogix 5580; 1 = 3 MB of standard user memory; E = Embedded EtherNet/IP port (1 Gb) on the controller front.
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Independent Supplier

NJT Automation is an independent supplier of surplus, refurbished, and pre-owned industrial automation equipment. Unless expressly stated otherwise, NJT Automation is not an authorized distributor, dealer, representative, or affiliate of the original equipment manufacturer (OEM) for any products offered on this website.

Product Condition & Warranty

Products sold by NJT Automation may be surplus inventory, discontinued models, older series, or units with earlier manufacturing date codes than those currently available from the OEM or its authorized distribution network. As NJT Automation is not an authorized distributor, manufacturer warranties, support programs, and other OEM services may not apply. Any warranty provided is solely that of NJT Automation, where applicable.

Firmware & Software Licensing

Certain programmable logic controllers (PLCs), drives, HMIs, and other electronic products may require firmware to operate. While some products may include firmware, NJT Automation makes no representations or warranties regarding whether firmware is installed, the firmware version or revision level, its compatibility with your application, or its licensing status.

NJT Automation does not provide, obtain, transfer, or license firmware on behalf of customers. We make no representation regarding your ability or legal right to obtain, download, install, or use firmware from the OEM, its authorized distributors, or any other source. It is the customer's sole responsibility to ensure compliance with all applicable End User License Agreements (EULAs), software licenses, intellectual property rights, and other terms governing the acquisition, installation, and use of firmware.