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1756-L85E

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The 40 MB Allen-Bradley 1756-L85E anchors the standard ControlLogix 5580 range for its largest network and motion workloads.
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Technical specifications for 1756-L85E

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L85E
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 5580 Controller
  • Stock:
    1
  • Product Series:
    ControlLogix 5580
  • User Memory:
    40 MB
  • EtherNet/IP Devices:
    300 with Studio 5000 v28 or later
  • Integrated Ethernet:
    1 x 1 Gb EtherNet/IP port
  • Local Programming Port:
    1 x USB 2.0
  • Nonvolatile Storage:
    4 GB Secure Digital card (1784-SD4) preinstalled
  • Maximum Digital I/O:
    128,000 points
  • Maximum Analog I/O:
    4,000 points
  • Power Dissipation:
    6.2 W
  • Operating Temperature:
    0 to 60 °C in Series C chassis; 0 to 50 °C in Series B chassis
  • Weight:
    0.394 kg
  • Estimated shipping dimensions:
    3.46x14.52x13.96cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Motion Scale OPC UA Scale Redundancy Tradeoff Product Applications

Features:

  • Memory position: 40 MB is the largest standard ControlLogix 5580 allocation in this batch
  • Motion ceiling: the official product record lists support for as many as 256 axes
  • Recovery medium: a 4 GB 1784-SD4 card provides the controlled nonvolatile project path
1756-L85E addresses resource-heavy control projects that combine extensive application logic with a high device population.

1756-L85E does not turn published maximums into independent guarantees because motion, messaging, I/O updates, and task execution share controller resources.

1756-L85E selection should be supported by compiled statistics and load testing for the intended topology, firmware, data clients, and recovery plan.

Apter Power can coordinate catalog verification, official documentation, architecture questions, and quotation support for 1756-L85E.
Allen-Bradley 1756-L85E ControlLogix 5580 Controller Manuals, Datasheets, Links Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Published ceiling: up to 256 axes defines the controller-level motion boundary
  • Shared resources: axis updates, tasks, connections, and communication traffic must be budgeted together
  • Hardware path: qualified drives, motion interfaces, and network modules remain part of the complete design
  • Software gate: Logix Designer version 36 or later enables the published OPC UA capacity
  • Information model: up to 15,000 OPC UA nodes supports extensive tag and diagnostic exposure
  • Client validation: subscriptions, certificates, and controller execution should be tested under load
  • Firmware baseline: full controller redundancy is supported from version 33.00.02
  • Network change: the embedded Ethernet port is disabled in a redundant controller pair
  • Motion exclusion: integrated motion is not supported while the controller operates redundantly
  • Large distributed control: standard Logix systems with extensive logic and EtherNet/IP device populations
  • Complex motion: standalone coordinated-motion designs sized from compiled and measured resources
  • Information-rich automation: qualified OPC UA deployments exposing large controller data models
Description
At the top of the standard 5580 memory range, Allen-Bradley 1756-L85E provides 40 MB of user memory, integrated 1 Gb EtherNet/IP, and one-slot ControlLogix installation. It is intended for projects whose compiled logic, communication objects, and expansion plan exceed the lower controller tiers.

Rockwell Automation positions 1756-L85E for the largest standard 5580 network tier, but attainable scale still depends on the controller resources left by the compiled project. The same catalog supports a large OPC UA information model and coordinated motion when the required software and hardware paths are engineered together.

Architecture matters as much as headline scale for 1756-L85E. Redundant operation disables the embedded Ethernet port and integrated motion, while a high-axis standalone system must still budget execution, connections, update periods, communication modules, and recovery media for the real machine.
Revisions

Revision Part #

Also known as

1756-L85E Series B
1756-L85E/B, Series B
Alternative Names
Allen-Bradley ControlLogix 5580 L85E Rockwell Automation 1756 L85E Processor ControlLogix 5580 40 MB Controller
Technical notes
Treat the 300-node figure for 1756-L85E as a recommended controller maximum, not guaranteed project capacity. Logix Designer version 28 or later supports that boundary, yet messages, motion, tasks, update rates, and memory consume shared resources; validate the compiled application and network schedule before committing the final I/O architecture.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why can 1756-L85E run out of resources before every planned EtherNet/IP node is added?
The node figure is a recommended maximum, while messages, produced and consumed tags, motion, tasks, update rates, and memory share controller resources. Review the Capacity view and compiled project.
What happens to a motion project when 1756-L85E is changed to redundant operation?
Integrated motion is not supported in the redundant controller state. Separate the availability and motion requirements, redesign the architecture, and validate the supported firmware and communication modules.
How should an OPC UA client load be qualified for 1756-L85E?
Use Logix Designer version 36 or later, define the required information model, configure certificates and trust, then test subscription demand against task execution and communication diagnostics.
Can the USB port on 1756-L85E serve as a permanent supervisory interface?
No. USB is a temporary local programming connection. Use the integrated EtherNet/IP path or a supported ControlLogix communication module for operational traffic.
Which observations matter when 1756-L85E shows intermittent performance under peak load?
Capture task overlaps, scan and execution times, communication usage, missed updates, motion diagnostics, client subscription rates, and memory margin before changing the update schedule.
What should incoming inspection compare before 1756-L85E is accepted as a critical spare?
Match catalog and series markings, firmware, chassis compatibility, network identity, SD image, approved project revision, and physical condition; document the result before storage or installation.