Allen-Bradley 1756-L81E ControlLogix – Ready to Ship / Pick Up
In stock: 1756-L81E 3 MB ControlLogix 5580 controller, embedded 1 Gb EtherNet/IP port. NJT Automation has 4 units available in Milwaukee, WI, ready to ship or available for local pickup. Includes a one-year full-function warranty.
$2,499.99 – $3,499.99USD
| Part Number | 1756-L81E |
| Description | ControlLogix 5580 controller, 3 MB. In stock in refurbished and unused surplus condition, Series B. |
| Shipping | Ships today UPS Ground included | Next-Day Air and Worldwide Shipping available at checkout |
| Pickup | Free local pickup at 2122 N Prospect Ave. Call ahead at (414) 331-5954. |
| Warranty | 1-year full-function warranty provided by NJT Automation. Warranty details
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| Returns | 90-day free returns. View return policy |
| Exchange | Send us your defective 1756-L81E after your purchase for a 10% core credit ($250 – $350). We also purchase old or damaged parts outright. |
Replacement Options for 1756-L81E
In stock and ready to ship today
| Variants | Part NumberConditionSeriesQtyPrice 1756-L81E /B$2,499.99 Refurbished · Series B · 1 in stock1756-L81E /BRefurbishedSeries B1$2,499.99 USD 1756-L81E /B$3,249.99 Unused surplus (new old stock) · Series B · 1 in stock1756-L81E /BUnused surplus (new old stock)Series B1$3,249.99 USD 1756-L81ES /B$3,499.99 Unused surplus (new old stock) · Series B · 2 in stock1756-L81ES /BUnused surplus (new old stock)Series B2$3,499.99 USD | ||||||||||||||||||||||||||||||||
| Availability | Multiple Options Available | ||||||||||||||||||||||||||||||||
| Repairs | 1756-L81E Mail-In Repair ServiceEstimated: $1,440.00 | ||||||||||||||||||||||||||||||||
Part Number Decoder | ControlLogix 5580 controller 1756L81E 3 MB ControlLogix 5580 controller, embedded 1 Gb EtherNet/IP port.
Decoded from the Rockwell Automation catalog-number structure. Series and firmware revision are printed on the product label, not encoded here. | ||||||||||||||||||||||||||||||||
Series & Revisions | Series B in stock; other series on request. Series B controllers run firmware revision 31.011 or later; Series A units also run the earlier 5580 revisions (28 to 30). Every series needs a Series B or Series C 1756 chassis (Series B derated to 50 °C ambient); 5580 controllers do not work in a Series A chassis. Series notes: Studio 5000 keys on catalog number and firmware revision, not series. Fitting a Series B into a project on revision 28 to 30 means upgrading the project to 31 or later first. | ||||||||||||||||||||||||||||||||
Intended Use | Designed for plant-wide discrete, process, and motion control applications. ControlLogix controllers run high I/O-count machines, batch and continuous process lines, and coordinated multi-axis motion from a single chassis, with redundancy and plant-network connectivity when the application calls for it. Typical homes are automotive and tire plants, food and beverage lines, water and wastewater, oil and gas skids, and large packaging systems. | ||||||||||||||||||||||||||||||||
Physical Data | Weight and DimensionsWeight0.87 lb (0.39 kg)H × W × D5.7 × 1.4 × 5.7 in. (145 × 35 × 145 mm)
Product weight and dimensions are typical manufacturer-published values and may differ by series or option. Shipping box and weight are estimates for freight planning; the packed unit may ship in a different box. | ||||||||||||||||||||||||||||||||
Datasheet | Datasheet available for download Generated from product specifications; not an official Allen-Bradley datasheet. For an official datasheet, contact Allen-Bradley or an authorized distributor. | ||||||||||||||||||||||||||||||||
Similar Part Numbers | |||||||||||||||||||||||||||||||||
Allen Bradley Information | Technical Specifications15 parameters from manufacturer-published specifications
Typical manufacturer-published values for this catalog number; confirm against the current manufacturer documentation before specifying. | ||||||||||||||||||||||||||||||||
Alternate Part Numbers | 1756L81E | ||||||||||||||||||||||||||||||||
| Category | ControlLogix | ||||||||||||||||||||||||||||||||
| UPC / GTIN | 887172361326 | ||||||||||||||||||||||||||||||||
| Part Number | 1756-L81E | ||||||||||||||||||||||||||||||||
| Manufacturer | Allen-Bradley | ||||||||||||||||||||||||||||||||
Previously sold 1756-L81E9 sold
NJT Automation has supplied and shipped 9 1756-L81E ControlLogix 5580 controllers since 2024; these listings are sold and the in-stock options above are ready to ship.
- Sold
- 9 since 2024
- Price range
- $2,200 – $3,400, median $2,700
- By condition
- Unused surplus (7)$2,200 – $3,400Used (2)$2,500 – $2,650
- Series
- B × 9
Typical sold price for a 1756-L81E: used around $2,575 and unused surplus around $2,700.
Can the 1756-L81E be repaired?
Yes. NJT Automation repairs the 1756-L81E by mail-in: diagnostic evaluation, component-level repair and a functional test, backed by a 1-year full-function warranty.
NJT managed repair. No evaluation fee; no repair, no charge. Prepaid UPS label both ways, $650 minimum, rush available. 1-year full-function warranty included, 2- and 3-year options.
Prefer an independent shop? Compare bids on RepairMode; providers set their own pricing and warranty.
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
Repair or replace?
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.
Photos by NJT Automation; test videos from NJT or network repair technicians.
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