1756-L72 | Allen-Bradley ControlLogix Logix5572 Processor with 4 Mbytes Memory
1756-L72 | Allen-Bradley ControlLogix Logix5572 Processor with 4 Mbytes Memory
1756-L72 | Allen-Bradley ControlLogix Logix5572 Processor with 4 Mbytes Memory
    1756-L72 | Allen-Bradley ControlLogix Logix5572 Processor with 4 Mbytes Memory
1756-L72 | Allen-Bradley ControlLogix Logix5572 Processor with 4 Mbytes Memory

1756-L72 | Allen-Bradley ControlLogix Logix5572 Processor with 4 Mbytes Memory

Part #: 1756-L72 Manufactured by: Allen-Bradley
$1,899.00
$1,899.00
9 in Stock
Condition: New-Surplus Original Box
Shipping calculated at checkout.
Product Overview
The 1756-L72 provides high-performance logic execution, robust storage options, and efficient power management to support ...  Read more
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Product Description P/N: 1756-L72

Description / Specifications

Description 

The Allen-Bradley 1756-L72 is a ControlLogix processor module designed for high-performance control applications. It provides 4 MB user memory with 0.98 MB I/O memory and includes a built-in USB interface for programming and configuration.

 

 

Technical Specifications 

Brand Allen-Bradley
Series ControlLogix
Part Number 1756-L72
Manufacturer Rockwell Automation
I-O Memory 0.98 MB
Module Type Processor Module
Nonvolatile Memory 1 GB (1784-SD1 ships with every controller) 2 GB (1784-SD2)
User Memory 4 MB
Maximum I-O 128,000
Communication 1 port USB
USB Port Communication Programming, configuration, and on-line edits
Maximum Analog I-O 4,000
Maximum Digital I-O 128,000
Current Draw (1.2 Volts DC) 5 milliamps
Current Draw (5.1 Volts) 800 milliamps
User Memory 4MB
Power Dissipation 2.5 Watts
Backplane Current (1.2 Volts DC) 5 mA
Thermal Dissipation 8.5 BTU per hour
Backplane Current (5.1 Volts DC) 800 mA
Isolation Voltage 30 Volts Continuous
Relative Humidity 5-95 percent
Enclosure None
Operating shock 30G
Redundancy Full Support
Programming Languages Relay ladder Structured text Function block SFC

  

 

Information About 1756-L72

The 1756-L72 is part of the ControlLogix controller family from Allen-Bradley, engineered for reliable operation in large-scale automation systems. It supports up to 128,000 digital I/O and 4,000 analog I/O points, making it suitable for complex control processes. The controller comes with a 1 GB nonvolatile SD card (1784-SD1) and allows expansion to 2 GB (1784-SD2) for secure storage of diagnostic and system data. Integrated capacitor energy storage modules provide protection during power loss, while its rugged design ensures stable performance under demanding industrial conditions.

Key Features:

  • Memory Capacity: Equipped with 4 MB user memory and 0.98 MB I/O memory, allowing efficient program execution and handling of large data sets.

  • Nonvolatile Storage: Ships with a 1 GB SD card for system and diagnostic data logging, with an option to expand to 2 GB using the 1784-SD2 card.

  • Connectivity: Features a USB port that supports programming, system configuration, and online edits for flexible engineering tasks.

  • High I/O Handling: Capable of supporting up to 128,000 digital I/O points and 4,000 analog I/O points, ensuring scalability for complex systems.

  • Power Management: Consumes only 2.5 W with low backplane current draw, reducing energy usage and heat generation.

  • Energy Backup: Supports capacitor energy storage modules (1756-ESMCAP/ESMNRM series) for fault tolerance and system recovery after power interruptions.

  • Robust Operation: Withstands 30G operating shock and relative humidity from 5–95%, enabling use in tough industrial environments.

  • System Integration: Fully compatible with ControlLogix modular platforms, allowing seamless expansion with communication and I/O modules.

The 1756-L72 delivers the reliability and precision required for large-scale industrial automation and process control.


 

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-L72
Question: What is the 1756-L72?
Date Update:30/05/2025
Answer:

The 1756-L72 is a ControlLogix 5570 series programmable logic controller (PLC) from Allen-Bradley. It is a modular, high-performance controller designed for complex industrial automation applications. The 1756-L72 is capable of handling large, data-intensive systems, and supports integration with various I/O modules, motion control, and networking protocols. It is widely used in industries like manufacturing, process control, and automation.

Question: Where can I find the manual for the 1756-L72?
Date Update:30/05/2025
Answer:

The manual for the 1756-L72 is available on the Rockwell Automation website. The manual provides detailed instructions on installation, wiring, configuration, programming, and troubleshooting. You can access the manual by visiting the Allen-Bradley support page or by searching for the 1756-L72 in the Product Documentation section. The manual can also be found within Studio 5000 or RSLogix 5000 software, which can guide you through the configuration and setup process.

Question: Can the 1756-L72 be used in hazardous environments?
Date Update:30/05/2025
Answer:

The 1756-L72 controller has an IP20 enclosure rating, which means it is designed for dry, indoor environments. It is not rated for hazardous locations (e.g., areas with explosive gases or materials). For use in hazardous environments, consider using explosion-proof or intrinsically safe equipment, or install the controller in an appropriate enclosure that complies with the required safety standards.

Question: What should I do if the 1756-L72 is not communicating?
Date Update:30/05/2025
Answer:

If the 1756-L72 is not communicating:

  1. Check the Ethernet cables: Ensure that the Ethernet cables are properly connected and the network switch is functioning correctly.
  2. Verify IP settings: Check that the IP address is correctly configured and there are no conflicts with other devices on the network.
  3. Check the power supply: Ensure that the controller is receiving the correct 24V DC power input.
  4. Check RSLinx: Use RSLinx Classic to verify that the controller is visible on the network.
  5. Review fault indicators: Inspect the status LEDs on the controller for any fault indications (e.g., Fault LED illuminated).

For detailed troubleshooting steps, refer to the manual and Studio 5000 diagnostic tools.

Question: How do I update the firmware on the 1756-L72?
Date Update:30/05/2025
Answer:

To update the firmware on the 1756-L72 controller:

  1. Launch Studio 5000 and open your project with the 1756-L72 controller.
  2. Check the current firmware version: Under the controller properties, check the installed firmware version.
  3. Download the latest firmware from the Rockwell Automation website or through Studio 5000.
  4. Start the firmware update: In Studio 5000, navigate to the controller properties and select the firmware update option. Follow the on-screen instructions.
  5. Verify the update: After the firmware is updated, verify that the new version appears in the controller properties and that the controller operates correctly.

It is recommended to back up your program before performing any firmware update to avoid data loss.

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-L72 is a ControlLogix processor module designed for high-performance control applications. It provides 4 MB user memory with 0.98 MB I/O memory and includes a built-in USB interface for programming and configuration.

 

 

Technical Specifications 

Brand Allen-Bradley
Series ControlLogix
Part Number 1756-L72
Manufacturer Rockwell Automation
I-O Memory 0.98 MB
Module Type Processor Module
Nonvolatile Memory 1 GB (1784-SD1 ships with every controller) 2 GB (1784-SD2)
User Memory 4 MB
Maximum I-O 128,000
Communication 1 port USB
USB Port Communication Programming, configuration, and on-line edits
Maximum Analog I-O 4,000
Maximum Digital I-O 128,000
Current Draw (1.2 Volts DC) 5 milliamps
Current Draw (5.1 Volts) 800 milliamps
User Memory 4MB
Power Dissipation 2.5 Watts
Backplane Current (1.2 Volts DC) 5 mA
Thermal Dissipation 8.5 BTU per hour
Backplane Current (5.1 Volts DC) 800 mA
Isolation Voltage 30 Volts Continuous
Relative Humidity 5-95 percent
Enclosure None
Operating shock 30G
Redundancy Full Support
Programming Languages Relay ladder Structured text Function block SFC

  

 

Information About 1756-L72

The 1756-L72 is part of the ControlLogix controller family from Allen-Bradley, engineered for reliable operation in large-scale automation systems. It supports up to 128,000 digital I/O and 4,000 analog I/O points, making it suitable for complex control processes. The controller comes with a 1 GB nonvolatile SD card (1784-SD1) and allows expansion to 2 GB (1784-SD2) for secure storage of diagnostic and system data. Integrated capacitor energy storage modules provide protection during power loss, while its rugged design ensures stable performance under demanding industrial conditions.

Key Features:

  • Memory Capacity: Equipped with 4 MB user memory and 0.98 MB I/O memory, allowing efficient program execution and handling of large data sets.

  • Nonvolatile Storage: Ships with a 1 GB SD card for system and diagnostic data logging, with an option to expand to 2 GB using the 1784-SD2 card.

  • Connectivity: Features a USB port that supports programming, system configuration, and online edits for flexible engineering tasks.

  • High I/O Handling: Capable of supporting up to 128,000 digital I/O points and 4,000 analog I/O points, ensuring scalability for complex systems.

  • Power Management: Consumes only 2.5 W with low backplane current draw, reducing energy usage and heat generation.

  • Energy Backup: Supports capacitor energy storage modules (1756-ESMCAP/ESMNRM series) for fault tolerance and system recovery after power interruptions.

  • Robust Operation: Withstands 30G operating shock and relative humidity from 5–95%, enabling use in tough industrial environments.

  • System Integration: Fully compatible with ControlLogix modular platforms, allowing seamless expansion with communication and I/O modules.

The 1756-L72 delivers the reliability and precision required for large-scale industrial automation and process control.


 

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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