1756-L74 | Allen-Bradley ControlLogix Logix5574 Processor with 16 Mbytes Memory
1756-L74 | Allen-Bradley ControlLogix Logix5574 Processor with 16 Mbytes Memory
1756-L74 | Allen-Bradley ControlLogix Logix5574 Processor with 16 Mbytes Memory
    1756-L74 | Allen-Bradley ControlLogix Logix5574 Processor with 16 Mbytes Memory
1756-L74 | Allen-Bradley ControlLogix Logix5574 Processor with 16 Mbytes Memory

1756-L74 | Allen-Bradley ControlLogix Logix5574 Processor with 16 Mbytes Memory

Part #: 1756-L74 Manufactured by: Allen-Bradley
$4,799.00
$4,799.00
4 in Stock
Condition: New – Open box
Shipping calculated at checkout.
Product Overview
Allen Bradley ControlLogix Processor Module with 0.98 MB I-O Memory and 16 MB User Memory
We accept:
  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa
Contact Us!

Talk to a real expert.

phone
+1 (828) 222-3490
email
sales@iqelectro.com
Mon–Sat, 7:00 AM – 8:00 PM (EST)
warranty
IQElectro 2-Year Warranty
Warranty for Product #: 1756-L74
IQElectro offers a free 2-year warranty on all products. You can trust that every purchase is a reliable investment in the future of your company. Warranty Terms
2-3 Day Free Shipping
Packed Ready to Ship
24/7 Expert Support
Return within 30-Days
IQElectro is Not an authorized distributor for Allen-Bradley
Original Manufacturer's Warranty Not Covered, This Product is SURPLUS.

Product Description P/N: 1756-L74

Description / Specifications

Description 

The Allen-Bradley 1756-L74 is a high-performance ControlLogix® controller designed for complex automation systems requiring large memory capacity and multi-network communication. Equipped with 16 MB of user memory and broad connectivity options, it supports large-scale machine control, process automation and motion applications. This processor is widely used in manufacturing, utilities, material handling and high-availability control systems.

 

 

Technical Specifications 

Condition New / Never Used Surplus
Brand Allen-Bradley
Category Controllers
Part Number 1756-L74
Subcategory ControlLogix® 5570
Memory (User) 16 MB
Memory (I/O) Approx. 0.98 MB
Non-Volatile Memory SD card (optional)
Communication Ports (Onboard) 1 USB programming port
Supported Networks (via modules) EtherNet/IP, ControlNet, DeviceNet, DH+, Remote I/O, SynchLink, third-party protocols
Maximum Digital I/O ~128,000
Maximum Analog I/O ~4,000
Total Supported I/O 128,000
Controller Connections Up to 500
Motion Axis Supported Up to 100
Power Consumption 5 mA @ 1.2 VDC, 800 mA @ 5.1 VDC
Display Type 4-character digital display
Mounting ControlLogix chassis
Operating Temperature 0…60 °C
Relative Humidity 5–95% non-condensing
Shock Rating IEC 60068-2-27
Vibration IEC 60068-2-6
Enclosure Open-style
Certifications CE, UL, cUL, KC, RCM, Marine

  

 

Information About 1756-L74

The 1756-L74 is part of the ControlLogix 5570 family, offering advanced processing performance, expanded memory, and support for up to 500 controller connections. It features 16 MB of user memory and dedicated I/O memory, making it suitable for high-speed logic tasks and large distributed architectures. The controller supports a wide range of communication protocols through compatible communication modules, including EtherNet/IP, ControlNet, DeviceNet, DH+, SynchLink, and third-party networks. A built-in USB programming port simplifies configuration and diagnostics, while an optional SD card provides non-volatile storage for firmware and project backup. Optimized for industrial environments, the 1756-L74 operates from 0 to 60 °C and can control up to 100 motion axes within a Logix-based system.

Key Features:

  • Large User Memory: 16 MB of application memory plus dedicated I/O memory for large projects.
  • High Connection Capacity: Supports up to 500 controller connections for expansive architectures.
  • Broad Network Support: Interfaces with EtherNet/IP, ControlNet, DeviceNet, DH+, SynchLink and more via communication modules.
  • USB Programming Port: Simplifies firmware loading, project download and troubleshooting.
  • SD Card Support: Optional secure digital card enables non-volatile storage and automatic project recovery.
  • Motion Control Ready: Supports up to 100 integrated motion axes within Logix motion systems.
  • Enhanced Diagnostics: Four-character alpha-numeric status display aids fast system evaluation.
  • Robust Environmental Ratings: Operates in 0–60 °C with high vibration and shock tolerance for harsh industrial settings.
  • Flexible Mounting: Installs in any slot of a ControlLogix chassis for modular, scalable system design.
  • High Reliability: Offers conformal coating on "K" versions to protect in demanding applications.

The 1756-L74 provides the processing performance, flexibility and reliability needed for advanced industrial automation and large distributed control systems.

Frequently Asked Questions about 1756-L74
Question: How much memory does the 1756-L74 provide?
Date Update:05/06/2025
Answer:

The 1756-L74 controller includes 16 MB of user memory and 0.98 MB of I/O memory. It also comes with a 1GB non-volatile memory module (1784-SD1) that ships pre-installed. This non-volatile memory can be expanded up to 2GB with the 1784-SD2 module. This memory configuration ensures reliable storage of programs and data.

Question: Does the 1756-L74 support communication with other networks?
Date Update:05/06/2025
Answer:

Yes, the 1756-L74 supports a wide range of industrial network protocols. While it has a built-in USB port for basic communication, it also allows for optional communication adapters. These adapters can connect the controller to networks like EtherNet/IP, ControlNet, DeviceNet, and more. This flexibility enables integration into diverse automation systems.

Question: What power supply is recommended for the 1756-L74?
Date Update:05/06/2025
Answer:

The 1756-L74 is designed to work with standard 1756 series power supplies, such as 1756-PA50, 1756-PA72, and 1756-PA72K. For redundant power supply setups, compatible models include 1756-PA75R and 1756-PB75R. This flexibility allows users to choose the best configuration for their specific needs. Using the recommended power supplies ensures reliable operation.

Question: What are the environmental specifications of the 1756-L74?
Date Update:05/06/2025
Answer:

The 1756-L74 operates in temperatures ranging from 0 to 60°C and can withstand non-operating temperatures from -40 to 85°C. It can handle vibration levels of 10g at 500Hz and shock levels up to 30g during operation. Its open-style enclosure allows for easy integration into existing systems. These features ensure reliability in a variety of industrial settings.

Question: Is the 1756-L74 still in production?
Date Update:05/06/2025
Answer:

Yes, the 1756-L74 is currently in production. It has an active lifecycle status and is available for new installations. This means users can continue to integrate it into their systems without concerns about obsolescence. Its active status also ensures ongoing support and availability of spare parts.

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-L74 is a high-performance ControlLogix® controller designed for complex automation systems requiring large memory capacity and multi-network communication. Equipped with 16 MB of user memory and broad connectivity options, it supports large-scale machine control, process automation and motion applications. This processor is widely used in manufacturing, utilities, material handling and high-availability control systems.

 

 

Technical Specifications 

Condition New / Never Used Surplus
Brand Allen-Bradley
Category Controllers
Part Number 1756-L74
Subcategory ControlLogix® 5570
Memory (User) 16 MB
Memory (I/O) Approx. 0.98 MB
Non-Volatile Memory SD card (optional)
Communication Ports (Onboard) 1 USB programming port
Supported Networks (via modules) EtherNet/IP, ControlNet, DeviceNet, DH+, Remote I/O, SynchLink, third-party protocols
Maximum Digital I/O ~128,000
Maximum Analog I/O ~4,000
Total Supported I/O 128,000
Controller Connections Up to 500
Motion Axis Supported Up to 100
Power Consumption 5 mA @ 1.2 VDC, 800 mA @ 5.1 VDC
Display Type 4-character digital display
Mounting ControlLogix chassis
Operating Temperature 0…60 °C
Relative Humidity 5–95% non-condensing
Shock Rating IEC 60068-2-27
Vibration IEC 60068-2-6
Enclosure Open-style
Certifications CE, UL, cUL, KC, RCM, Marine

  

 

Information About 1756-L74

The 1756-L74 is part of the ControlLogix 5570 family, offering advanced processing performance, expanded memory, and support for up to 500 controller connections. It features 16 MB of user memory and dedicated I/O memory, making it suitable for high-speed logic tasks and large distributed architectures. The controller supports a wide range of communication protocols through compatible communication modules, including EtherNet/IP, ControlNet, DeviceNet, DH+, SynchLink, and third-party networks. A built-in USB programming port simplifies configuration and diagnostics, while an optional SD card provides non-volatile storage for firmware and project backup. Optimized for industrial environments, the 1756-L74 operates from 0 to 60 °C and can control up to 100 motion axes within a Logix-based system.

Key Features:

  • Large User Memory: 16 MB of application memory plus dedicated I/O memory for large projects.
  • High Connection Capacity: Supports up to 500 controller connections for expansive architectures.
  • Broad Network Support: Interfaces with EtherNet/IP, ControlNet, DeviceNet, DH+, SynchLink and more via communication modules.
  • USB Programming Port: Simplifies firmware loading, project download and troubleshooting.
  • SD Card Support: Optional secure digital card enables non-volatile storage and automatic project recovery.
  • Motion Control Ready: Supports up to 100 integrated motion axes within Logix motion systems.
  • Enhanced Diagnostics: Four-character alpha-numeric status display aids fast system evaluation.
  • Robust Environmental Ratings: Operates in 0–60 °C with high vibration and shock tolerance for harsh industrial settings.
  • Flexible Mounting: Installs in any slot of a ControlLogix chassis for modular, scalable system design.
  • High Reliability: Offers conformal coating on "K" versions to protect in demanding applications.

The 1756-L74 provides the processing performance, flexibility and reliability needed for advanced industrial automation and large distributed control systems.

Check Out These Related Products