Product Overview

The Allen-Bradley 1756-L85E is the flagship processor of the ControlLogix 5580 controller family manufactured by Rockwell Automation, engineered to serve as the central processing unit for large-scale, high-throughput industrial automation systems. Incorporating 40 MB of user memory, an embedded 1 gigabit EtherNet/IP port, and a front-access USB 2.0 programming interface, the 1756-L85E delivers the largest program capacity and highest EtherNet/IP node support available in the standard ControlLogix 5580 lineup, making it the natural choice for enterprise-wide supervisory control and multi-line coordination.

Positioned at the top of the 5580 generation, the 1756-L85E provides approximately 45% more capacity than the preceding ControlLogix 5570 series and supports up to 300 EtherNet/IP devices, 256 axes of integrated motion, 128,000 discrete I/O points, and 4,000 analog I/O points. Internally, the controller manages up to 32 simultaneous tasks with 1,000 programs per task, enabling engineers to segment complex applications into logically isolated, priority-driven execution contexts. A 4-character alpha/numeric display on the front panel provides immediate status and fault-code visibility, while a Secure Digital (SD) card slot paired with the bundled 1784-SD2 memory card delivers nonvolatile backup of the user program and tag data — and the internal Energy Storage Module (ESM) eliminates the field-replaceable battery required by earlier controller generations.

Programming is performed with Studio 5000 Logix Designer software (version 28.011 or higher), connected through the embedded gigabit EtherNet/IP port or the front USB port. As the largest standard member of the 1756 ControlLogix chassis ecosystem, the 1756-L85E shares a common backplane, I/O platform, and engineering environment with the rest of the Rockwell Logix portfolio, allowing plants standardized on Allen-Bradley hardware to adopt the controller without altering existing chassis, I/O wiring, or network topology — a key reason the 1756-L85E continues to be specified for new builds and migrations alike across manufacturing, oil and gas, water treatment, power generation, and logistics operations worldwide.

Technical Specifications