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      Allen-Bradley 1756-L81E
      Allen-Bradley 1756-L81E
      Allen-Bradley 1756-L81E
      Allen-Bradley 1756-L81E
      Allen-Bradley 1756-L81E
      Allen-Bradley 1756-L81E
      · Product image is representative; revision or series may vary. Contact us to request a specific version.
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      1756-L81E

      Controller CPU Module
      In Stock
      Ships by Tuesday, June 23
      Fast Shipping Available

      Product Information:

      The Allen-Bradley 1756-L81E is a high-performance ControlLogix 5580 programmable automation controller (PAC) manufactured by Rockwell Automation. It represents the entry-level memory capacity of the L8x (5580) flagship platform, offering faster processing speeds, integrated motion control functions, and high-speed communication capabilities compared to the traditional L7x series.

      The Allen-Bradley 1756-L81E features rich task management capabilities. This model can efficiently handle up to 32 tasks, enabling high flexibility and complex operations.

      Warranty Policy
      We provide 1 year warranty for all remaining parts.
      The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
      Return Notice
      The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
      In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
      Shiping Mode
      Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
      Parts Availability
      Moore automated offers a wide range of components, products and services related to industrial automation. We have a large surplus of stocks and are also distributors of new products from a variety of quality manufacturers.
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      Technical specifications for 1756-L81E

      • Manufacturer:
        Allen-Bradley
      • Product Category:
        PLC System
      • Estimated shipping dimensions:
        20.3 x 15.6 x 14.5 cm
      • Weight:
        1.23 kg
      • Tariff Code:
        8537101190
      • Country of origin:
        USA
      • Place of shipment:
        Xiamen, Fujian, China
      • Isolation Voltage:
        50 Volts Continuous
      • Power Dissipation:
        6.2 Watts
      • Current Draw (5.1 Volts):
        1.20 Miliamperes
      • Current Draw (1.2 Volts DC):
        5.0 Miliamperes
      • User Memory:
        3 MB
      • I-O Memory:
        N/A
      • Product Line:
        ControlLogix
      • Product Type:
        Controller module
      • Number of Tasks:
        32 Tasks
      • Number of Programs per Task:
        1000 Programs per Task
      • USB Ports:
        1 Port
      • USB Port Speed:
        12 Mbps
      • Ethernet Port:
        1 Port
      • Ethernet Port Speeds:
        10, 100, or 1000 Mbps
      • Supported Communication:
        Ethernet,ControlNet,DeviceNet,Remote I/O
      • Stock:
        100
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      Revisions

      Revision Part #

      Also known as

      1756-L81E/A
      1756-L81E Ser A, Series A, Rev A
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      1756-L81E/B
      1756-L81E Ser B, Series B, Rev B
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      Alternative Names

      1756L81E 1756 L81E I756-L8IE 1756-LB1E I756L81IE 1756LB1E 1756-L82E 1756-L83E 1756-L85E 1756-L84E 1756-L81E-NSE 1756-L81E-NSEXT 1756-L81EXT 1756-L81EK 1756-L81EP 1756-L81EPXT 1756-L81ES

      Information

      Overview Manuals Principle Core Applications

      Features:

      • Standard ControlLogix Series Industrial Controller
      • It is equipped with a USB port and an embedded Ethernet port
      • The 1756-L81E standard controller supports Ethernet communication speeds of 10 Mbps, 100 Mbps, and 1000 Mbps
      The Allen-Bradley 1756-L81E standard controller communicates via Ethernet at speeds of 10 Mbps, 100 Mbps, and 1000 Mbps. In addition to Ethernet, the 1756-L81E standard controller can also communicate via DeviceNet, ControlNet, Data Highway Plus, Synchlink, and remote I/O networks, as well as various third-party networks. This controller has 3 MB of user memory and can be installed in any available slot in the system chassis.

      ControlLogix's latest and most advanced product family. It is a programmable automation controller (PAC) with modern connectivity and functionality, serving as a migration platform for legacy controllers such as the PLC5 and SLC500, and meeting the demands of demanding industrial applications.

      The 1756-L81E Allen Bradley Controller module may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
      Allen Bradley 1756-L81E Controller module Manuals(Datasheets), Link 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.
      The 1756-L81E is the entry-level product in the 1756-L8 series of controllers, equipped with only 3 MB of user memory and 2 GB of non-volatile memory (implemented via a 1784-SD2 Secure Digital (SD) card). This controller can handle up to 128,000 discrete input/output signals and 4,000 analog input/output signals. Furthermore, it employs an environmentally friendly energy storage solution that provides backup for the controller's RAM without the need for batteries.
      This controller is designed for demanding industrial environments requiring high-speed data throughput and precise motion control:
      High-Speed ​​Motion Control: Supports integrated motion control of up to 256 axes via EtherNet/IP, making it ideal for packaging lines, robots, and complex assembly systems.
      Discrete Manufacturing: Suitable for high-speed assembly and material handling in smart factories, where rapid I/O processing (up to 128,000 digital points) is critical.
      Process Automation: Utilizes the PlantPAx process library for chemical, pharmaceutical, and food ingredient systems.
      Safety-Critical Systems: Can be used for SIL 2/PLd safety applications or in conjunction with safety partners to meet SIL 3 requirements.
      Modernization Platform: Can serve as an upgrade path for legacy PLC-5 and SLC 500 systems, enabling older plants to upgrade to modern gigabit connectivity.

      Manuals

      Technical notes

      The Allen-Bradley 1756-L81E is a high-performance programmable automation controller (PAC) belonging to the ControlLogix 5580 series. It features 3 MB of user memory, a built-in 1 Gbps Ethernet port, and a USB port for local programming. Supporting up to 60 Ethernet nodes and 128,000 I/O points, this controller employs a battery-free built-in energy storage module (ESM) design and features digitally signed firmware and integrated CIP security features. It is designed to provide stable support for high-speed I/O throughput, motion control, and data acquisition in medium to large industrial environments.

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      FAQ

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      • What is the architectural significance of the 1756-L81E within the ControlLogix automation platform?
        The 1756-L81E serves as a high-performance ControlLogix 5580 series CPU, embodying an integrated multi-core processor architecture designed to facilitate deterministic, real-time control and extensive data handling across complex industrial processes. Its advanced computational throughput enables seamless integration of discrete, analog, motion, and safety control within a unified control environment.
      • What are the principal processing capabilities and memory resources available on the 1756-L81E controller?
        The 1756-L81E is equipped with a 1.2 GHz ARM Cortex-A9 quad-core processor architecture, complemented by 2 GB of user memory and a non-volatile memory block that supports application retention and rapid startup. This substantial memory facilitates complex program execution, enhanced data logging, and efficient handling of extensive I/O datasets.
      • What redundancy and fault-tolerance mechanisms are implemented in the 1756-L81E controller?
        This model supports controller redundancy through ControlLogix’s Redundant Ethernet module architecture, allowing for seamless switchover in failover scenarios. The controller also includes watchdog timers, error detection and correction algorithms, and comprehensive diagnostic reporting to ensure operational continuity and minimize downtime.
      • How does the 1756-L81E integrate safety functions within its control architecture?
        The 1756-L81E supports embedded safety control applications via integration with GuardLogix safety modules and leverages Safety over EtherNet/IP (SoEIP) communication. This enables real-time monitoring and control of safety-critical functions in compliance with SIL 3 / PLe safety standards.
      • What programming environment and languages are compatible with the 1756-L81E?
        Programming for the 1756-L81E is conducted via Studio 5000 Logix Designer, supporting IEC 61131-3 languages including Ladder Logic (LD), Structured Text (ST), Function Block Diagram (FBD), Sequential Function Chart (SFC), and Continuous Function Chart (CFC). The controller also supports Add-On Instructions and user-defined data types to facilitate modular programming.
      • What security features are incorporated within the 1756-L81E to mitigate cyber threats in industrial networks?
        The 1756-L81E incorporates user authentication, role-based access control (RBAC), and supports secure Ethernet protocols such as HTTPS, SSH, and TLS. Its firmware supports regular security patches and the integration of Firewalls and VPNs, aligning with Rockwell Automation’s Defense-in-Depth cybersecurity framework.
      • What are the expansion capabilities and module compatibility for the 1756-L81E within a ControlLogix chassis?
        The 1756-L81E supports up to 63 ControlLogix modules in a single chassis, including analog, digital, motion, safety, and communication modules. It fully interoperates with Logix 5580 series I/O and third-party CIP-compliant devices, enabling flexible and scalable system architectures.
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      Moore Disclaimer: Moore Automated's sales automation equipment and related solutions are intended for industrial automation and business operational efficiency improvement purposes only. Product information, technical parameters, and application cases are for reference only and do not constitute an absolute guarantee of performance for any specific industry, scenario, or final application. Actual equipment performance may vary depending on factors such as the usage environment, system integration method, and maintenance conditions. Users should confirm compatibility and safety based on professional technical assessments. Moore Automated assumes no liability for any direct or indirect losses caused by improper use, modification, or failure to operate according to specifications, to the extent permitted by law.
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