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1756-L81ES

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Allen-Bradley 1756-L81ES is a compact GuardLogix 5580 controller that combines standard execution with a governed safety task.
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Technical specifications for 1756-L81ES

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L81ES
  • Product Family:
    ControlLogix
  • Product Type:
    GuardLogix 5580 Safety Controller
  • Stock:
    1
  • Product Series:
    GuardLogix 5580
  • Standard User Memory:
    3 MB
  • Safety Memory:
    1.5 MB
  • EtherNet/IP Devices:
    100
  • 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
  • Safety Task Language:
    Ladder diagram
  • 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:
    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 Task Governance Thermal Placement Network Behavior Product Applications

Features:

  • Safety architecture: one safety task is governed separately from 31 available standard tasks
  • Recovery medium: a 4 GB 1784-SD4 card supports the controlled project and firmware record
  • Network role: the official GuardLogix table lists support for as many as 100 EtherNet/IP nodes
1756-L81ES is the compact GuardLogix 5580 choice for projects that coordinate standard machine control and validated safety logic.

1756-L81ES cannot be assessed as a standard controller with an added label because task governance, memory allocation, partner hardware, and validation evidence are safety-specific.

1756-L81ES procurement should begin with the required integrity level and finish with a matched controller, partner configuration, firmware, signatures, and test record.

Apter Power can coordinate catalog checks, safety-partner matching, official literature, and quotation support for 1756-L81ES.
Allen-Bradley 1756-L81ES GuardLogix 5580 Safety 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.
  • Task allocation: 31 standard tasks and one safety task separate ordinary and governed execution
  • Safety language: the safety task is programmed in ladder diagram
  • Memory control: 3 MB standard and 1.5 MB safety allocations must be compiled independently
  • Series boundary: Series C operation extends to 60 °C, while Series B is limited to 50 °C
  • Above 55 °C: for SIL 2/PLd use, modules dissipating more than 6.2 W must not be adjacent
  • Cabinet impact: slot order and neighboring module heat therefore belong in the safety review
  • Node allowance: the controller supports as many as 100 EtherNet/IP nodes
  • Partner effect: front-port message capacity changes when a safety partner is installed
  • Service port: USB remains a temporary programming connection rather than an operational network
  • Integrated machine safety: standard sequencing and governed safety logic in one GuardLogix platform
  • Protected machine functions: validated safety logic coordinating permitted machine states and reactions
  • Partner-based designs: higher-integrity architectures using the qualified partner and complete validation
Description
Designed for integrated standard and safety control, Allen-Bradley 1756-L81ES provides 3 MB of standard user memory and 1.5 MB of safety memory in one GuardLogix 5580 controller. Its architecture separates the standard task set from the governed safety task while sharing the ControlLogix chassis and EtherNet/IP platform.

Safety integrity determines the bill of material around 1756-L81ES. A qualified safety partner becomes part of the complete validated function when the required integrity level exceeds the primary controller's published path, so controller-only procurement can leave the safety architecture incomplete.

Software and validation records are essential when replacing 1756-L81ES. The safety task uses ladder diagram, the standard and safety memory pools are managed separately, and acceptance must preserve firmware, signatures, partner identity when used, I/O paths, fault reactions, and the approved recovery image.
Revisions

Revision Part #

Also known as

1756-L81ES Series B
1756-L81ES/B, Series B
Alternative Names
Allen-Bradley GuardLogix 5580 L81ES Rockwell Automation 1756 L81ES Safety Controller GuardLogix 5580 3 MB Safety CPU
Technical notes
Define the required integrity level before ordering 1756-L81ES. The primary controller supports SIL 2 and Category 3/PLd, while SIL 3 and Category 4/PLe require a qualified 1756-L8SP safety partner; verify the complete hardware path, safety signature, firmware, and validation plan rather than accepting a controller-only substitution.
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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 should be checked when 1756-L81ES does not recognize an installed safety partner?
Compare partner catalog and series, slot placement, controller and partner firmware, project configuration, status indicators, and the approved safety architecture before replacing either module.
What must be preserved before replacing 1756-L81ES in a validated machine?
Retain the approved project, safety signature, firmware, partner identity when used, I/O mapping, network settings, recovery image, and validation record before removing the original controller.
How should a cabinet layout be reviewed when 1756-L81ES operates above 55 °C?
For a SIL 2/PLd application, identify neighboring modules above the published 6.2 W threshold and rearrange the slot plan if needed; then recheck the enclosure thermal assessment.
Why can a redundancy design conflict with the safety architecture of 1756-L81ES?
GuardLogix redundancy requires a supported version 37-or-later design, but the redundant state does not support the safety partner. Resolve the target integrity level before choosing redundancy.
What should maintenance do after 1756-L81ES reports a safety fault?
Preserve the fault code, task and partner status, signatures, I/O indicators, recent changes, and validation state before any reset; follow the machine's approved safety-recovery procedure.
Which commissioning records are added when 1756-L81ES uses CIP Security?
Use a supported version 34.00.01-or-later environment and record certificates, trusted endpoints, time synchronization, recovery access, and the repeated safety and communication acceptance results.