Allen-Bradley 1756-L81ESK ControlLogix Processor 3 MB
Allen-Bradley 1756-L81ESK GuardLogix 5580 safety controller, 3 MB GuardLogix 5580 safety controller, embedded 1 Gb EtherNet/IP port, conformal-coated. NJT Automation sources the 1756-L81ESK on request; send the part number for a replacement or repair quote.
Quote required. Request a quote below for pricing and delivery.
Actual NJT inventory photos
| Part Number | 1756-L81ESK |
| Price | On Request Availability and condition determine final quote. |
| Description | GuardLogix 5580 safety controller, 3 MB. |
| Shipping | UPS Ground included | Next-Day Air and Worldwide Shipping available at checkout |
| 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-L81ESK after your purchase for a 10% core credit. We also purchase old or damaged parts outright. |
| Availability | Sourced on request We do not have a 1756-L81ESK on the shelf right now. We can source one through our supplier network; request a quote and we confirm availability, price and lead time before you commit. | ||||||||
| Sourcing | Sourced through our Level 1 network of vetted US suppliers. Each unit is checked before it ships and carries the same NJT warranty and return policy as our own stock. Quotes within one hour during business hours; typical delivery 3–5 business days, next-day air available. Sourced parts are not available for local pickup. | ||||||||
| Repairs | 1756-L81ESK Mail-In Repair Service | ||||||||
Part Number Decoder | GuardLogix 5580 safety controller 1756L81ESK 3 MB GuardLogix 5580 safety controller, embedded 1 Gb EtherNet/IP port, conformal-coated.
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 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 | Intended 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. Safety-rated for use in GuardLogix safety chains up to SIL 3 / PLe. Conformal coating suits corrosive or high-humidity atmospheres (ANSI/ISA 71.04 G3), such as pulp and paper, wastewater, chemical and coastal sites. | ||||||||
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. | ||||||||
Allen Bradley Information | Technical SpecificationsLifecycle status
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| Category | ControlLogix | ||||||||
| Part Number | 1756-L81ESK | ||||||||
| Manufacturer | Allen-Bradley | ||||||||
Can the 1756-L81ESK be repaired?
Yes. NJT Automation repairs the 1756-L81ESK 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.
Compare quotes from independent repair technicians. Post your repair on RepairMode to receive competitive bids from experienced technicians. Each technician sets their own pricing and warranty.
Find a PLC repair specialiston RepairMode.com ↗Common failures
Failure patterns we regularly see on GuardLogix 5580 safety controller hardware like the 1756-L81ESK:
- 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
- Controller will not boot or shows a solid red OK LED (nonrecoverable major fault) after a power event
Photos by NJT Automation; test videos from NJT or network repair technicians.
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