1756-L85E

Product information

Product Overview

The 1756-L85E is the top-memory ControlLogix 5580 controller: 40 MB of user memory, a USB 2.0 programming port, one embedded 1 Gbps EtherNet/IP port supporting up to 300 EtherNet/IP devices, and support for up to 256 axes of integrated motion. It targets the largest ControlLogix programs — plant-wide supervisory control, data-intensive batching, and high-axis-count motion coordinated with sequential logic.

Technical Specifications (Official Rockwell Data)

Product family	ControlLogix 5580 controller
User memory	40 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 300
Motion axes supported	256
Local programming port	1 × USB 2.0 full-speed, Type B
Power draw	5 mA @ 1.2 V DC, 1.20 A @ 5.1 V DC
Power dissipation (full load)	6.2 W
Controller tasks	32 tasks, 1000 programs per task
Programming languages	Ladder Diagram, Structured Text, Function Block Diagram, Sequential Function Chart
Product series	Series B
Lifecycle status (Rockwell)	Active

Lifecycle Status & Availability

Rockwell lists the 1756-L85E as Active with repair options available. Within the 5580 family it carries the largest user memory (40 MB) and the highest EtherNet/IP device capacity (300), and is fully supported in current Studio 5000 releases.

Typical Applications

• Plant-wide control where one controller aggregates many remote I/O drops, drives and panels — up to 300 EtherNet/IP devices
• Large batching and formulation systems with extensive recipe and data-logging structures
• High-axis-count motion applications (printing, converting, assembly) that still fit a single ControlLogix chassis

Related & Compatible Models

The 5580 memory ladder is L81E (3 MB) → L83E (10 MB) → L85E (40 MB). Downward-compatible migration paths exist from discontinued 5561 (2 MB) and mature 5570 controllers — chassis, power supplies and I/O are reused. For safety-integrated applications see the GuardLogix 5580 line (e.g. 1756-L81ES).

Requesting a Quotation

Send the complete catalog number including series/firmware revision (a nameplate photo is ideal), required quantity, and any SD card or peripheral modules needed. Commercial terms — availability, price, lead time — are always confirmed by individual quotation.

Frequently Asked Questions

When should I choose L85E over L83E?

Choose the L85E when program size, tag counts or data handling push past the 10 MB / 250-device envelope of the L83E — typical triggers are plant-level aggregation, heavy data logging, or very large motion programs. Otherwise the L83E delivers identical networking and motion capability at lower cost.

Is the 40 MB memory expandable?

No. User memory is fixed at 40 MB. The SD card serves as non-volatile backup/removable storage, not as executable memory expansion. Size the controller by program requirements rather than adding memory later.

Can the L85E run safety logic like a GuardLogix?

No. Safety execution requires the GuardLogix 5580 family (e.g. 1756-L81ES) with its dedicated safety memory partition and safety partner module. A standard L85E can coexist on the same network with GuardLogix controllers.

Does it work in my existing 1756-A4 chassis?

5580 controllers occupy one slot in any 1756 chassis. Check the backplane current budget of your power supply against the controller draw (5 mA @ 1.2 V, 1.20 A @ 5.1 V) plus all other modules — include your chassis layout in the quotation request if unsure.