1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
    1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
    1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
    1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory
1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory

1756-L73 | Allen-Bradley ControlLogix Logix5673 Processor with 8 Mbytes Memory

Part #: 1756-L73 Manufactured by: Allen-Bradley
Regular price
$2,345.00
Sale price
$2,345.00
Regular price
9 in Stock
Condition: New-Surplus Original Box
Shipping calculated at checkout.
Product Overview
The Allen-Bradley 1756-L73 is a ControlLogix controller. It is part of the Programmable Automation Controller (PAC) family...  Read more
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Product Description P/N: 1756-L73

Description / Specifications

Description 

The Allen-Bradley 1756-L73 is a ControlLogix 5570 programmable automation controller (PAC) with 8 MB user memory and 0.98 MB I/O memory. It is designed for medium-to-large automation applications, offering high-speed processing, motion control, and flexible communication. This controller is widely used in process industries, manufacturing, and high-availability systems requiring reliability and scalability.

 

 

Technical Specifications 

Brand Allen-Bradley
Series ControlLogix 
Part Number 1756-L73
Manufacturer Rockwell Automation
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
Chassis 1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K,1756-A17, 1756- A17K
Communication interfaces One (1) USB
Enclosure None (Open-Style)
Isolation Voltage 30 Volts Continuous
Current Draw (1.2 Volts DC) 5.0 Miliamperes
Current Draw (5.1 Volts) 800 Miliamperes
Power Dissipation 2.5 Watts
I-O Memory 0.98 MB
User Memory 8 MB
Maximum I-O 128,000
Maximum Analog I-O 4,000
Maximum Digital I-O 128,000
Thermal Dissipation 8.5 BTU per hour

  

 

Information About 1756-L73

The 1756-L73 belongs to the ControlLogix 5570 series of controllers from Allen-Bradley, developed to deliver robust control performance and integrated communications. With capacity for 32 controller tasks and 100 programs per task, it provides the processing power needed for complex applications. The unit supports up to 128,000 digital I/O points and 4000 analog I/O points, ensuring compatibility with both local and distributed architectures. Communication flexibility is a key feature, with built-in support for Ethernet/IP, ControlNet, DeviceNet, Synchlink, DH+, RIO, and third-party networks. Integrated motion is supported through SERCOS interface, analog sensors, and Ethernet/IP motion control. It offers up to 500 controller connections, making it suitable for interconnected systems. Equipped with 8 MB of user memory, USB 2.0 port for programming (up to 12 Mbps), and energy storage technology (no battery required), the 1756-L73 is designed for convenience and reduced maintenance. With a compact one-slot footprint, 2.5 W power dissipation, and rugged environmental ratings (0–60 °C, 5–95% non-condensing humidity, 30 g operating shock), it ensures reliable operation in demanding automation environments.

Key Features:

  • Design: Compact, one-slot ControlLogix PAC with 8 MB user memory and 0.98 MB I/O memory.
  • Performance: Handles 32 tasks and up to 100 programs per task; supports 500 controller connections.
  • Connectivity: Supports Ethernet/IP, ControlNet, DeviceNet, Synchlink, DH+, RIO, and third-party protocols.
  • Motion Integration: Compatible with SERCOS, Ethernet/IP motion, and analog motion sensors.
  • Programming: USB 2.0 interface with multiple IEC 61131-3 languages (ladder, FBD, ST, SFC).
  • Energy Storage: Built-in energy storage eliminates the need for backup batteries.
  • Environmental Ratings: Operates at 0–60 °C with vibration up to 2 g and 30 g operating shock.
  • Compatibility: Fully integrates with ControlLogix chassis and modules across the Logix platform.

The 1756-L73 delivers the reliability, performance, and scalability required for modern industrial automation and high-availability control applications.


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-L73
Question: What is the 1756-L73?
Date Update:30/05/2025
Answer:

The 1756-L73 is a ControlLogix 5570 controller from Allen-Bradley. It is part of the 1756-series ControlLogix PLCs and is designed for high-speed and complex control applications. The 1756-L73 supports up to 8MB of memory and integrates seamlessly with ControlLogix I/O modules, motion control, and other devices over Ethernet/IP. It provides powerful processing capabilities for a variety of industrial applications, from machine control to process automation.

Question: Where can I find the manual for the 1756-L73?
Date Update:30/05/2025
Answer:

The manual for the 1756-L73 is available on the Rockwell Automation website. You can find the user manual, installation guide, and quick start guide in the Product Documentation section for ControlLogix controllers. The manuals provide detailed instructions for installation, configuration, wiring, and troubleshooting.

Question: How do I configure the 1756-L73 controller?
Date Update:30/05/2025
Answer:

To configure the 1756-L73 controller, follow these steps:

  1. Install Studio 5000 (or RSLogix 5000) software on your PC.
  2. Create a new project in Studio 5000 and select the 1756-L73 controller from the device catalog.
  3. Set up communication by configuring the Ethernet/IP settings and assigning the correct IP address to the controller.
  4. Add I/O modules: Expand the system by adding appropriate ControlLogix I/O modules via the configuration tree.
  5. Develop the program: Use ladder logic, function block diagrams, or structured text to create the control logic for your system.
  6. Download the program to the controller and test the communication and control.

Detailed configuration steps are available in the manual, and additional help can be accessed within Studio 5000 software.

Question: Can the 1756-L73 be used in hazardous locations?
Date Update:30/05/2025
Answer:

The 1756-L73 controller is designed for indoor use with an IP20 rating, making it suitable for dry, indoor environments where dust and moisture are limited. It is not suitable for hazardous locations (e.g., explosion-proof or intrinsically safe environments). If you need a controller for hazardous environments, you should consider models that are rated for use in such environments, like those with an ATEX or Class I Division 2 rating.

Question: How do I troubleshoot the 1756-L73 controller?
Date Update:30/05/2025
Answer:

To troubleshoot the 1756-L73 controller, follow these steps:

  1. Check the status LEDs on the controller to identify any fault conditions (e.g., Status LED, Run/Stop LED, Fault LED).
  2. Verify power supply: Ensure the controller is receiving the correct 24V DC power input.
  3. Check the communication network: Use RSLinx or Studio 5000 to monitor the controller’s communication status. Verify that the Ethernet/IP and other communication networks are operational.
  4. Review error codes: If there is an issue, consult the error codes and diagnostics provided in the Studio 5000 or RSLogix 5000 diagnostic tools.
  5. Check program logic: If the system is not behaving as expected, verify the program logic in Studio 5000 or RSLogix 5000 to ensure that the control processes are correct.

You can also refer to the user manual for specific troubleshooting steps based on the fault codes.

IQElectro is not an authorized distributor.
QElectro 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-L73 is a ControlLogix 5570 programmable automation controller (PAC) with 8 MB user memory and 0.98 MB I/O memory. It is designed for medium-to-large automation applications, offering high-speed processing, motion control, and flexible communication. This controller is widely used in process industries, manufacturing, and high-availability systems requiring reliability and scalability.

 

 

Technical Specifications 

Brand Allen-Bradley
Series ControlLogix 
Part Number 1756-L73
Manufacturer Rockwell Automation
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
Chassis 1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K,1756-A17, 1756- A17K
Communication interfaces One (1) USB
Enclosure None (Open-Style)
Isolation Voltage 30 Volts Continuous
Current Draw (1.2 Volts DC) 5.0 Miliamperes
Current Draw (5.1 Volts) 800 Miliamperes
Power Dissipation 2.5 Watts
I-O Memory 0.98 MB
User Memory 8 MB
Maximum I-O 128,000
Maximum Analog I-O 4,000
Maximum Digital I-O 128,000
Thermal Dissipation 8.5 BTU per hour

  

 

Information About 1756-L73

The 1756-L73 belongs to the ControlLogix 5570 series of controllers from Allen-Bradley, developed to deliver robust control performance and integrated communications. With capacity for 32 controller tasks and 100 programs per task, it provides the processing power needed for complex applications. The unit supports up to 128,000 digital I/O points and 4000 analog I/O points, ensuring compatibility with both local and distributed architectures. Communication flexibility is a key feature, with built-in support for Ethernet/IP, ControlNet, DeviceNet, Synchlink, DH+, RIO, and third-party networks. Integrated motion is supported through SERCOS interface, analog sensors, and Ethernet/IP motion control. It offers up to 500 controller connections, making it suitable for interconnected systems. Equipped with 8 MB of user memory, USB 2.0 port for programming (up to 12 Mbps), and energy storage technology (no battery required), the 1756-L73 is designed for convenience and reduced maintenance. With a compact one-slot footprint, 2.5 W power dissipation, and rugged environmental ratings (0–60 °C, 5–95% non-condensing humidity, 30 g operating shock), it ensures reliable operation in demanding automation environments.

Key Features:

  • Design: Compact, one-slot ControlLogix PAC with 8 MB user memory and 0.98 MB I/O memory.
  • Performance: Handles 32 tasks and up to 100 programs per task; supports 500 controller connections.
  • Connectivity: Supports Ethernet/IP, ControlNet, DeviceNet, Synchlink, DH+, RIO, and third-party protocols.
  • Motion Integration: Compatible with SERCOS, Ethernet/IP motion, and analog motion sensors.
  • Programming: USB 2.0 interface with multiple IEC 61131-3 languages (ladder, FBD, ST, SFC).
  • Energy Storage: Built-in energy storage eliminates the need for backup batteries.
  • Environmental Ratings: Operates at 0–60 °C with vibration up to 2 g and 30 g operating shock.
  • Compatibility: Fully integrates with ControlLogix chassis and modules across the Logix platform.

The 1756-L73 delivers the reliability, performance, and scalability required for modern industrial automation and high-availability control applications.


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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