1756-L81E | Allen-Bradley ControlLogix Logix5580 Processor, 3MB, EtherNet/USB
1756-L81E | Allen-Bradley ControlLogix Logix5580 Processor, 3MB, EtherNet/USB
1756-L81E | Allen-Bradley ControlLogix Logix5580 Processor, 3MB, EtherNet/USB
    1756-L81E | Allen-Bradley ControlLogix Logix5580 Processor, 3MB, EtherNet/USB
1756-L81E | Allen-Bradley ControlLogix Logix5580 Processor, 3MB, EtherNet/USB

1756-L81E | Allen-Bradley ControlLogix Logix5580 Processor, 3MB, EtherNet/USB

Part #: 1756-L81E Manufactured by: Allen-Bradley
$3,686.00
$3,686.00
39 in Stock
Condition: New-Surplus Original Box
Shipping calculated at checkout.
Product Overview
The Allen-Bradley 1756-L81E provides high-performance control within the ControlLogix 5580 family, combining robust memory...  Read more
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Product Description P/N: 1756-L81E

Description / Specifications

Description 

The Allen-Bradley 1756-L81E is a ControlLogix 5580 programmable automation controller designed for high-performance industrial control applications. It features embedded Ethernet and USB ports, 3 MB of user memory, and supports multiple industrial network protocols for flexible integration.

 

 

Technical Specifications 

Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1756-L81E
Module Type ControlLogix Controller
Redundant Power Supply 1756-PA75R, 1756-PA75RK, 1756-PB75R, 1756-PB75RK, 1756-PSCA2, 1756-PSCA2K
Standard Power Supply 1756-PA50, 1756-PA72, 1756-PA72K, 1756-PA75, 1756-PA75K, 1756-PB50, 1756-PB72, 1756-PB72K, 1756-PB75, 1756-PB75K, 1756-PH75, 1756-PC75
Chassis 1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K,1756-A17, 1756-A17 K Series B, Series C
Communication interfaces One (1) Ethernet; One (1) USB
Enclosure None (Open-Style)
Isolation Voltage 50 Volts Continuous
User Memory 3 MB
Current Draw (1.2 Volts DC) 5.0 Miliamperes
Current Draw (5.1 Volts) 1.20 Miliamperes
Power Dissipation 6.2 Watts
Series ControlLogix
Maximum I-O 128,000
Maximum Analog I-O 4,000
Maximum Digital I-O 128,000
Thermal Dissipation 21.2 BTU per hour

  

 

Information About 1756-L81E

The 1756-L81E is part of the Allen-Bradley ControlLogix 5580 family, offering advanced performance and connectivity for modern automation systems. It supports Ethernet communication at 10/100/1000 Mbps through its embedded Ethernet port and also provides a USB interface for programming and diagnostics. Beyond Ethernet, it can interface with ControlNet, DeviceNet, Remote I/O, SynchLink, Data Highway Plus, and third-party networks through additional modules. The controller comes with 3 MB of user memory and a 2 GB non-volatile SD card (1784-SD2), eliminating the need for battery backup by using an energy storage solution. Capable of handling up to 128,000 digital I/O and 4000 analog I/O points, it provides scalability for a wide range of industrial applications. The unit installs in any ControlLogix chassis slot and is well-suited for complex automation processes requiring fast response, reliability, and modern migration capability.

Key Features:

  • Communication: Embedded Ethernet port supporting 10/100/1000 Mbps and one USB programming/diagnostic port.
  • Memory: 3 MB user memory with 2 GB non-volatile SD card included, eliminating battery requirements.
  • Capacity: Supports up to 128,000 discrete I/O points and 4000 analog I/O points for large-scale systems.
  • Network Integration: Compatible with Ethernet/IP, ControlNet, DeviceNet, DH+, SynchLink, Remote I/O, and third-party networks.
  • Performance: High-speed processing ensures fast execution for demanding industrial applications.
  • Power: Draws 1.20 A at 5.1VDC and 5.0 A at 1.2VDC, with maximum power dissipation of 6.2 W.
  • Safety: 50 V continuous isolation voltage provides electrical protection within the system.
  • Installation: Fits into any slot of a ControlLogix chassis for flexible system design.

The 1756-L81E delivers the reliability and precision required for advanced control and automation in modern industrial environments.



Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

Frequently Asked Questions about 1756-L81E
Question: What is the main purpose of the 1756-L81E controller?
Date Update:30/05/2025
Answer:

The 1756-L81E is a high-performance ControlLogix controller used for large-scale industrial automation tasks. It serves as the central processing unit in systems that require high-speed logic execution and flexible communication. Its advanced processing capabilities make it suitable for complex control applications, including those with safety and motion integration.

Question: What are the physical dimensions of the 1756-L81E module?
Date Update:30/05/2025
Answer:

The 1756-L81E has a standard ControlLogix single-slot width, fitting into a chassis without requiring additional space. While precise millimeter dimensions are not always provided, it typically measures approximately 142 x 35 x 132 mm (H x W x D). Its compact form allows for dense installation in control cabinets.

Question: Which communication protocols are supported by the 1756-L81E?
Date Update:30/05/2025
Answer:

The 1756-L81E supports Ethernet/IP communication natively via its embedded port. It can also interface with other networks like DeviceNet, ControlNet, and third-party protocols using communication modules. This makes it highly adaptable to various industrial systems.

Question: What is the maximum number of I/O points it can handle?
Date Update:30/05/2025
Answer:

The 1756-L81E supports up to 128,000 digital I/O and 4,000 analog I/O points. This makes it suitable for large-scale control systems with numerous devices. The actual usable count depends on the application design and processor load.

Question: Is the 1756-L81E still in production?
Date Update:30/05/2025
Answer:

Yes, the 1756-L81E is an active product and continues to be manufactured by Rockwell Automation. It belongs to the modern 5580 family of ControlLogix controllers, which are currently supported and recommended for new applications. This ensures availability of firmware updates and technical support.

IQElectro is not an authorized distributor.
IQElectro LLC (IQElectro) is NOT an Authorized Distributor or in any way affiliated with Rockwell Automation, Siemens, or any other Manufacturers. IQElectro is NOT an Authorized Dealer of this product. The product may be of older version, date codes, or design than that available from authorized dealers. As IQElectro is not an authorized dealer of this product, the Original Manufacturer's Warranty and Support DO NOT apply. IQElectro sells SURPLUS only and DOES NOT SELL SOFTWARE or FIRMWARE licenses For more detailed information, please refer to the full version of our disclaimer policy Disclaimer Policy.
Description / Specifications

Description 

The Allen-Bradley 1756-L81E is a ControlLogix 5580 programmable automation controller designed for high-performance industrial control applications. It features embedded Ethernet and USB ports, 3 MB of user memory, and supports multiple industrial network protocols for flexible integration.

 

 

Technical Specifications 

Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1756-L81E
Module Type ControlLogix Controller
Redundant Power Supply 1756-PA75R, 1756-PA75RK, 1756-PB75R, 1756-PB75RK, 1756-PSCA2, 1756-PSCA2K
Standard Power Supply 1756-PA50, 1756-PA72, 1756-PA72K, 1756-PA75, 1756-PA75K, 1756-PB50, 1756-PB72, 1756-PB72K, 1756-PB75, 1756-PB75K, 1756-PH75, 1756-PC75
Chassis 1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K,1756-A17, 1756-A17 K Series B, Series C
Communication interfaces One (1) Ethernet; One (1) USB
Enclosure None (Open-Style)
Isolation Voltage 50 Volts Continuous
User Memory 3 MB
Current Draw (1.2 Volts DC) 5.0 Miliamperes
Current Draw (5.1 Volts) 1.20 Miliamperes
Power Dissipation 6.2 Watts
Series ControlLogix
Maximum I-O 128,000
Maximum Analog I-O 4,000
Maximum Digital I-O 128,000
Thermal Dissipation 21.2 BTU per hour

  

 

Information About 1756-L81E

The 1756-L81E is part of the Allen-Bradley ControlLogix 5580 family, offering advanced performance and connectivity for modern automation systems. It supports Ethernet communication at 10/100/1000 Mbps through its embedded Ethernet port and also provides a USB interface for programming and diagnostics. Beyond Ethernet, it can interface with ControlNet, DeviceNet, Remote I/O, SynchLink, Data Highway Plus, and third-party networks through additional modules. The controller comes with 3 MB of user memory and a 2 GB non-volatile SD card (1784-SD2), eliminating the need for battery backup by using an energy storage solution. Capable of handling up to 128,000 digital I/O and 4000 analog I/O points, it provides scalability for a wide range of industrial applications. The unit installs in any ControlLogix chassis slot and is well-suited for complex automation processes requiring fast response, reliability, and modern migration capability.

Key Features:

  • Communication: Embedded Ethernet port supporting 10/100/1000 Mbps and one USB programming/diagnostic port.
  • Memory: 3 MB user memory with 2 GB non-volatile SD card included, eliminating battery requirements.
  • Capacity: Supports up to 128,000 discrete I/O points and 4000 analog I/O points for large-scale systems.
  • Network Integration: Compatible with Ethernet/IP, ControlNet, DeviceNet, DH+, SynchLink, Remote I/O, and third-party networks.
  • Performance: High-speed processing ensures fast execution for demanding industrial applications.
  • Power: Draws 1.20 A at 5.1VDC and 5.0 A at 1.2VDC, with maximum power dissipation of 6.2 W.
  • Safety: 50 V continuous isolation voltage provides electrical protection within the system.
  • Installation: Fits into any slot of a ControlLogix chassis for flexible system design.

The 1756-L81E delivers the reliability and precision required for advanced control and automation in modern industrial environments.



Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

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