1756-L84E
1756-L84E
1756-L84E
1756-L84E
1756-L84E
1756-L84E
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1756-L84E

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With a 20 MB application tier, Allen-Bradley 1756-L84E serves large standard, data-intensive, and qualified redundant ControlLogix 5580 architectures.
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Technical specifications for 1756-L84E

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L84E
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 5580 Controller
  • Stock:
    1
  • Product Series:
    ControlLogix 5580
  • User Memory:
    20 MB
  • EtherNet/IP Devices:
    150 with Studio 5000 v29; 250 with v30 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:
    3.46x14.55x14.01cm
  • Tariff Code:
    8537101190
  • Country of origin:
    United States of America
  • 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 OPC UA Capacity Node Version Gate Secure Deployment Product Applications

Features:

  • Application tier: 20 MB supports large standard ControlLogix 5580 projects
  • Information capacity: version 36 or later supports a 10,000-node OPC UA model
  • Recovery medium: a 4 GB 1784-SD4 card supports the controlled nonvolatile project image
1756-L84E is selected when project scale, data exposure, or availability requirements exceed the middle 5580 configurations.

1756-L84E retains integrated Ethernet for standalone use while the redundant architecture shifts external communication to qualified chassis modules.

1756-L84E should be approved from compiled memory, software version, node inventory, redundancy intent, and recovery evidence rather than from memory size alone.

Apter Power can review official records, redundancy scope, controller identity, and quotation details for 1756-L84E.
Allen-Bradley 1756-L84E 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.
  • Version prerequisite: Logix Designer version 36 or later enables the published OPC UA function
  • Model ceiling: up to 10,000 OPC UA nodes supports extensive controller data exposure
  • Engineering impact: namespace, subscriptions, security, and execution load require joint validation
  • Version 29: the controller supports as many as 150 EtherNet/IP nodes
  • Version 30 onward: the published allowance rises to 250 nodes
  • Project control: the I/O-tree inventory and firmware baseline should be frozen before expansion
  • Supported baseline: CIP Security conformance is associated with qualified version 32-or-later environments
  • Policy assets: certificates, time sources, trusted peers, and recovery credentials need controlled ownership
  • Acceptance test: secure messaging and engineering access should be proved under representative load
  • Large automation: memory-intensive standard Logix control in a one-slot 1756 controller
  • High-volume data: qualified OPC UA integration for extensive controller information models
  • High availability: redundant non-motion control using matched chassis and separate communication modules
Description
Allen-Bradley 1756-L84E serves the upper standard ControlLogix 5580 range with 20 MB of user memory and integrated 1 Gb EtherNet/IP. The controller is intended for substantial Logix applications that still require a one-slot CPU and the modular communication options of the 1756 chassis.

Information and network scale are important differentiators for 1756-L84E. Rockwell Automation assigns it a much larger OPC UA node capacity from Logix Designer version 36 and increases its EtherNet/IP node allowance when a project moves from version 29 to version 30 or later.

A redundant design built around 1756-L84E is not a duplicate of its standalone topology. The redundancy firmware baseline, paired chassis, redundancy modules, external communication modules, and unsupported motion boundary must all be resolved before the project is released.
Revisions

Revision Part #

Also known as

1756-L84E Series B
1756-L84E/B, Series B
Alternative Names
Allen-Bradley ControlLogix 5580 L84E Rockwell Automation 1756 L84E CPU ControlLogix 5580 20 MB Controller
Technical notes
For a redundant 1756-L84E architecture, use controller firmware 33.00.02 or later and matched partner hardware. The embedded Ethernet port is disabled, integrated motion is unsupported, and external ControlLogix communication modules carry the plant network; document those topology changes before converting a standalone project or ordering a spare pair.
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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.
What must change when 1756-L84E is converted from standalone to redundant operation?
Use supported redundancy firmware, matched partner chassis, redundancy modules, and separate network modules. Remove any integrated-motion dependency and revalidate every external communication path.
Why can the embedded Ethernet link disappear after 1756-L84E enters a redundant pair?
That behavior follows the supported redundancy architecture: the controller's embedded port is disabled, so qualified ControlLogix communication modules must carry external traffic.
How should a large OPC UA namespace be commissioned on 1756-L84E?
Start with Logix Designer version 36 or later, define the required namespace, configure trust and certificates, then test client subscriptions together with controller task and communication load.
Why might secure communications fail after a firmware change on 1756-L84E?
Check the supported CIP Security baseline, certificates, clock synchronization, trusted endpoints, security policy, and recovery credentials before treating the fault as a physical network failure.
What should engineering recalculate when 1756-L84E is moved between chassis series?
Review the chassis and power-supply qualification, every installed module, slot plan, enclosure heat, and the applicable upper operating-temperature boundary for the target chassis series.
How can procurement confirm that 1756-L84E has enough project margin?
Request compiled memory and communication statistics from the approved project, include online-edit and expansion allowance, and compare the evidence with the intended firmware and network topology.

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