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PLC, I/O & HMI
1756-L81E
Allen-Bradley
Allen-Bradley ControlLogix 5580 controller reference for exact-model industrial sourcing inquiries.
This page identifies a sourcing reference. It does not guarantee continuous stock. Availability, condition, quantity, lead time, and commercial terms are confirmed after inquiry.
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Reference details
- Manufacturer / brand
- Allen-Bradley
- Model / reference
- 1756-L81E
- Series / type
- ControlLogix 5580 controller
- Condition
- Confirm with inquiry
- Quantity
- Confirm with inquiry
- Lead time
- Confirm with inquiry
Product information
Product Overview
The 1756-L81E is an Allen-Bradley ControlLogix 5580 controller, the current-generation flagship of the 1756 platform. It ships with 3 MB of user memory, a USB 2.0 programming port, and one embedded 1 Gbps EtherNet/IP port that supports up to 100 EtherNet/IP devices directly from the controller — no separate Ethernet bridge module required. A 4-character alphanumeric display on the front panel shows module status and node identity, which speeds up commissioning and troubleshooting in crowded cabinets.
Technical Specifications (Official Rockwell Data)
| Product family | ControlLogix 5580 controller |
|---|---|
| User memory | 3 MB |
| Non-volatile memory | Secure Digital (SD) card |
| Embedded network port | 1 × EtherNet/IP, 10 Mbps / 100 Mbps / 1 Gbps |
| EtherNet/IP devices supported | up to 100 |
| Local programming port | 1 × USB 2.0 full-speed, Type B |
| Communication options | EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, SynchLink, third-party networks via 1756 bridge modules |
| Programming software | Studio 5000 Logix Designer |
| Programming languages | Ladder Diagram (LD), Structured Text (ST), Function Block Diagram (FBD), Sequential Function Chart (SFC) |
| Controller tasks | 32 tasks, 1000 programs per task |
| Product series | Series B |
| Lifecycle status (Rockwell) | Active |
Lifecycle Status & Availability
Rockwell Automation lists the 1756-L81E with lifecycle status Active — it is in current production and fully supported in the latest Studio 5000 releases. As a member of the 5580 generation, it is the recommended platform for new ControlLogix projects and for migration away from discontinued 5561/5570 controllers.
Typical Applications
- High-speed discrete and process control where program size outgrows legacy 5561/5570 controllers
- Plant-wide EtherNet/IP architectures: controller talks to drives, remote I/O and HMI over the embedded 1 Gbps port
- Migration target for systems standardized on ControlLogix since the late 1990s — the 1756 chassis, I/O and power supplies are reused
- Multi-tasking applications that separate motion, interlocks and HMI logic into independent tasks
Related & Compatible Models
The 1756-L81E is the entry model of the 5580 memory ladder: L81E (3 MB) → L83E (10 MB) → L85E (40 MB). For safety-rated applications the GuardLogix 5580 1756-L81ES provides the same platform with a dedicated safety memory partition. All 5580 controllers mount in 1756 chassis (1756-A4 … A17) powered by 1756-Px7x series power supplies.
Requesting a Quotation
Send the complete catalog number including any suffix (e.g. 1756-L81E/-B), the firmware revision printed on the label, and the required quantity. Firmware revision matters for Studio 5000 compatibility, so a nameplate photo is the most reliable way to quote. This page lists technical data only — stock, pricing and lead time are confirmed individually by quotation.
Frequently Asked Questions
What is the difference between 1756-L81E and 1756-L81?
The suffix E marks the 5580 generation with an embedded 1 Gbps EtherNet/IP port and SD-card non-volatile memory. The plain 1756-L81 belongs to the older 5570 generation without an embedded Ethernet port, which requires a separate 1756-EN2T/ENBT bridge module for EtherNet/IP.
Which Studio 5000 version do I need for a 5580 controller?
ControlLogix 5580 controllers are programmed with Studio 5000 Logix Designer version 28 or later; a full nameplate photo lets us confirm the exact firmware revision and matching software edition before you order.
Can I drop a 1756-L81E into my existing 1756 chassis?
Yes. 5580 controllers occupy one slot of any 1756 chassis and are powered from the same 1756 power supplies. Chassis, I/O modules and wiring are typically reused during a controller upgrade.
Is the SD card included?
The controller supports Secure Digital cards as the non-volatile memory option. Confirm whether an SD card is required for your application and include it in the quotation request.
Do you supply 1756-L81E worldwide?
Requests are handled individually — send the catalog number, series/firmware revision and destination so the quotation can include confirmed availability and shipping terms.
MODEL INQUIRY
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