1756-L75 | Allen-Bradley ControlLogix Logix5575 Processor – 32 MB PAC Controller
1756-L75 | Allen-Bradley ControlLogix Logix5575 Processor – 32 MB PAC Controller
1756-L75 | Allen-Bradley ControlLogix Logix5575 Processor – 32 MB PAC Controller
    1756-L75 | Allen-Bradley ControlLogix Logix5575 Processor – 32 MB PAC Controller
1756-L75 | Allen-Bradley ControlLogix Logix5575 Processor – 32 MB PAC Controller

1756-L75 | Allen-Bradley ControlLogix Logix5575 Processor – 32 MB PAC Controller

Part #: 1756-L75 Manufactured by: Allen-Bradley
$2,449.00
$2,449.00
2 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 32 MB User Memory
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Product Description P/N: 1756-L75

Description / Specifications

Description

The Allen-Bradley 1756-L75 is a high-performance ControlLogix Logix5575 controller designed for large, complex automation systems. With 32 MB of user memory and 0.98 MB of I/O memory, it delivers exceptional processing capability for demanding control, motion, safety, and process applications.

 

 

Technical Specifications

Condition New/Never Used Surplus
Brand Allen-Bradley
Series ControlLogix
Part Number 1756-L75
Manufacturer Rockwell Automation
Module Type ControlLogix Processor Module
User Memory 32 MB
I/O Memory 0.98 MB
Max Digital I/O 128,000
Max Analog I/O 4,000
Communication Interfaces 1 USB 2.0 Port
Power Dissipation 2.5 W
Thermal Dissipation 8.5 BTU/hr
Current Draw (1.2V) 5 mA
Current Draw (5.1V) 800 mA
Isolation Voltage 30V Continuous
Energy Storage Capacitor-based (no battery)
Supported Chassis 1756-A4, A7, A10, A13, A17 (and K variants)
Standard Power Supplies 1756-PA50/72/75, PB50/72/75, PH75
Redundant Power Supplies 1756-PA75R, PB75R, PSCA2
Non-Volatile Storage 1784-SD1 (1 GB SD card included)
Enclosure Open style
Operating Temperature 0–60 °C
Storage Temperature –40–85 °C
Vibration 2 g @ 10–500 Hz
Shock 30 g operating / 50 g non-operating

  

 

Information About 1756-L75

The Allen-Bradley 1756-L75 is a flagship controller within the ControlLogix 5570 family, engineered for high-end, high-availability automation requirements. Its large 32 MB user memory enables execution of complex routines, integrated motion applications, and extensive tag databases. The controller supports up to 32 tasks, with each task capable of running 100 programs, allowing efficient organization of large automation projects. The 1756-L75 supports up to 128,000 digital I/O points and 4,000 analog I/O points, making it suitable for advanced manufacturing, processing, and PlantPAx Distributed Control System (DCS) applications. It includes a built-in USB 2.0 port for programming and diagnostics, operating at 12 Mbps.

Key Features:

  • 32 MB user memory + 0.98 MB I/O memory
  • Supports 32 tasks and up to 100 programs per task
  • Interfaces up to 128,000 digital I/O and 4,000 analog I/O
  • Built-in USB 2.0 programming port (12 Mbps)
  • Ships with 1784-SD1 1GB Secure Digital (SD) card
  • Capacitor-based energy storage—no battery required
  • Compatible with PlantPAx process automation architectures
  • Works with all ControlLogix 1756 chassis and power supplies
  • Supports redundant controller configurations
  • Broad communication support: EtherNet/IP, ControlNet, DeviceNet, DH+, RIO, SynchLink, and more

The 1756-L75 provides maximum performance in the Logix 5570 controller family, offering the memory, speed, and reliability needed for large-scale automation systems. Ideal for high-speed motion, complex batch processes, coordinated networks, and enterprise-level control, it is one of Rockwell Automation’s most capable PAC offerings.

Frequently Asked Questions about 1756-L75
Question: How does the 1756-L75 handle program storage and data retention?
Date Update:04/06/2025
Answer:

The 1756-L75 ships with a pre-installed 1784-SD1 Secure Digital (SD) card offering 1 GB of non-volatile memory for data backup. It also includes energy storage modules that maintain volatile memory contents during power interruptions, replacing traditional battery-based retention methods. This ensures that critical program data remains secure and that system configurations can be quickly restored. Additionally, the SD card simplifies program transfer and backup management.

Question: Which industrial communication protocols are compatible with the 1756-L75?
Date Update:04/06/2025
Answer:
  • EtherNet/IP
  • ControlNet
  • DeviceNet
  • Remote I/O
  • Data Highway Plus
  • SynchLink
  • Third-party process and device networks

These options provide the flexibility to integrate the controller into a wide range of automation systems.

Question: Does the 1756-L75 support high I/O capacity?
Date Update:04/06/2025
Answer:

The 1756-L75 supports up to 128,000 discrete I/O points and 4,000 analog I/O points, making it suitable for large-scale control systems. This extensive capacity ensures that the controller can handle complex processes with numerous field devices. It allows system integrators to build comprehensive automation solutions without compromising on performance. The I/O flexibility is a key advantage for expanding industrial control applications.

Question: What are the power and current requirements of the 1756-L75?
Date Update:04/06/2025
Answer:
  • Power dissipation: 2.5 Watts
  • Thermal dissipation: 8.5 BTU/hr
  • Current draw at 1.2 Volts DC: 5 mA
  • Current draw at 5.1 Volts DC: 800 mA

These specifications help ensure proper system power planning and thermal management.

Question: Is the 1756-L75 still in production?
Date Update:04/06/2025
Answer:

Yes, according to Rockwell Automation’s product lifecycle status, the 1756-L75 is currently classified as Active. This means it’s still manufactured, fully supported, and available for both new and existing installations.

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-L75 is a high-performance ControlLogix Logix5575 controller designed for large, complex automation systems. With 32 MB of user memory and 0.98 MB of I/O memory, it delivers exceptional processing capability for demanding control, motion, safety, and process applications.

 

 

Technical Specifications

Condition New/Never Used Surplus
Brand Allen-Bradley
Series ControlLogix
Part Number 1756-L75
Manufacturer Rockwell Automation
Module Type ControlLogix Processor Module
User Memory 32 MB
I/O Memory 0.98 MB
Max Digital I/O 128,000
Max Analog I/O 4,000
Communication Interfaces 1 USB 2.0 Port
Power Dissipation 2.5 W
Thermal Dissipation 8.5 BTU/hr
Current Draw (1.2V) 5 mA
Current Draw (5.1V) 800 mA
Isolation Voltage 30V Continuous
Energy Storage Capacitor-based (no battery)
Supported Chassis 1756-A4, A7, A10, A13, A17 (and K variants)
Standard Power Supplies 1756-PA50/72/75, PB50/72/75, PH75
Redundant Power Supplies 1756-PA75R, PB75R, PSCA2
Non-Volatile Storage 1784-SD1 (1 GB SD card included)
Enclosure Open style
Operating Temperature 0–60 °C
Storage Temperature –40–85 °C
Vibration 2 g @ 10–500 Hz
Shock 30 g operating / 50 g non-operating

  

 

Information About 1756-L75

The Allen-Bradley 1756-L75 is a flagship controller within the ControlLogix 5570 family, engineered for high-end, high-availability automation requirements. Its large 32 MB user memory enables execution of complex routines, integrated motion applications, and extensive tag databases. The controller supports up to 32 tasks, with each task capable of running 100 programs, allowing efficient organization of large automation projects. The 1756-L75 supports up to 128,000 digital I/O points and 4,000 analog I/O points, making it suitable for advanced manufacturing, processing, and PlantPAx Distributed Control System (DCS) applications. It includes a built-in USB 2.0 port for programming and diagnostics, operating at 12 Mbps.

Key Features:

  • 32 MB user memory + 0.98 MB I/O memory
  • Supports 32 tasks and up to 100 programs per task
  • Interfaces up to 128,000 digital I/O and 4,000 analog I/O
  • Built-in USB 2.0 programming port (12 Mbps)
  • Ships with 1784-SD1 1GB Secure Digital (SD) card
  • Capacitor-based energy storage—no battery required
  • Compatible with PlantPAx process automation architectures
  • Works with all ControlLogix 1756 chassis and power supplies
  • Supports redundant controller configurations
  • Broad communication support: EtherNet/IP, ControlNet, DeviceNet, DH+, RIO, SynchLink, and more

The 1756-L75 provides maximum performance in the Logix 5570 controller family, offering the memory, speed, and reliability needed for large-scale automation systems. Ideal for high-speed motion, complex batch processes, coordinated networks, and enterprise-level control, it is one of Rockwell Automation’s most capable PAC offerings.

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