AB 1756-L72
AB 1756-L72
AB 1756-L72
AB 1756-L72
AB 1756-L72
AB 1756-L72
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  • Lifecycle status

    Active Mature
    Rockwell Automation lists 1756-L72 as Active Mature. Verify the controller series, firmware, chassis compatibility, migration scope, and current supply conditions before replacement.

1756-L72

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Allen-Bradley 1756-L72 is a 4 MB ControlLogix 5570 controller for chassis systems that need more application memory than the 1756-L71 configuration.
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Technical specifications for 1756-L72

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L72
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 5570 Controller
  • Stock:
    1
  • User memory:
    4 MB
  • I/O memory:
    0.98 MB
  • Controller tasks:
    32 max
  • Programs per task:
    1000 with Logix Designer v24 or later
  • Digital I/O:
    128,000 max
  • Analog I/O:
    4,000 max
  • Local communication:
    USB 2.0 Type B for temporary programming
  • Power dissipation:
    2.5 W
  • Chassis slots:
    1
  • Operating temperature:
    0...60 °C
  • Nonoperating temperature:
    -40...85 °C
  • Relative humidity:
    5...95% noncondensing
  • Weight:
    0.25 kg
  • Estimated shipping dimensions:
    14.52 × 3.48 × 13.963 cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Capacity Task Timing Recovery Application

Features:

  • Expanded 5570 capacity: 4 MB user memory for larger standard projects
  • Chassis architecture: one controller slot with separately selected network modules
  • Logix execution: multi-task control using the supported programming languages
1756-L72 adds application headroom without changing the basic ControlLogix 5570 chassis concept.

The extra memory is valuable only when execution timing, network ownership, and motion requirements remain within the approved design.

Migration records should explain the capacity decision and identify the exact firmware, archive, SD image, and acceptance results.

Apter Power can coordinate official-document review, quotation, and sourcing support for 1756-L72.
Allen-Bradley 1756-L72 ControlLogix 5570 Controller Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Application Capacity Planning

  • Compiled project: compare actual use with the 4 MB user-memory boundary and approved reserve.
  • Growth control: include alarms, tags, online-edit margin, and planned equipment options.
  • I/O allocation: monitor the separate controller memory used by I/O data.

Task and Motion Scheduling

  • Execution profile: record periods, priorities, scan times, overlaps, and watchdogs.
  • Motion review: confirm axes and update rates against the target controller definition.
  • Acceptance: repeat timing measurements online after the controlled download.

Firmware and Recovery Strategy

  • Target revision: compile with the supported firmware before the outage begins.
  • Recovery image: verify the SD copy and installed energy-storage module.
  • Rollback: retain the original controller archive until functional testing is approved.

Application

  • Larger 5570 projects: provide additional capacity for code, data, and coordinated equipment.
  • Chassis control: own local and distributed I/O through selected ControlLogix modules.
  • Controlled upgrades: increase standard-controller capacity within an established 5570 architecture.
Description
1756-L72 is a 4 MB ControlLogix 5570 controller for standard chassis applications that need more project capacity than the 1756-L71. It retains the one-slot 5570 format and uses separate ControlLogix modules for plant communications.

With 1756-L72, engineers can divide logic among continuous, periodic, and event tasks while using the supported Logix programming languages for sequencing, process functions, and coordinated equipment control. The local USB connector remains a temporary engineering interface.

Selecting 1756-L72 requires more than confirming that the compiled project fits. Review task execution, motion scope, firmware support, communication paths, SD recovery, energy-storage hardware, and the controlled acceptance plan before changing a running 5570 system.
Revisions

Revision Part #

Also known as

1756-L72 Series A
1756-L72/A, Series A
1756-L72 Series B
1756-L72/B, Series B
Alternative Names
Allen-Bradley 1756-L72 Rockwell Automation 1756-L72 AB 1756-L72 1756-L72 1756L72 1756 L72 ControlLogix 1756-L72 ControlLogix 5570 1756-L72
Technical notes
Confirm the 1756-L72 series and firmware before conversion. Validate chassis communication paths, task timing, motion scope, SD recovery, and the approved rollback plan in the target ControlLogix system.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Can Allen-Bradley 1756-L72 replace 1756-L71 without project changes?
Not automatically. The higher memory capacity does not remove the need to convert the controller definition and verify firmware, chassis communication paths, motion objects, task timing, and the complete startup sequence.
Does Allen-Bradley 1756-L72 provide onboard EtherNet/IP communication?
No. The controller uses separate ControlLogix communication modules for plant networks. Confirm the selected module, chassis slot, network path, firmware, and connection load for the target system.
Can the Allen-Bradley 1756-L72 USB port be used as a permanent network connection?
No. Rockwell Automation documents the USB 2.0 Type B connector as a temporary programming interface. A supported ControlLogix communication module should be used for permanent network access.
What must match when choosing Allen-Bradley 1756-L72 Series A or Series B?
Match the complete catalog number, hardware series, supported firmware, energy-storage hardware, Studio 5000 Logix Designer version, chassis modules, and the approved controller project.
How should Secure Digital recovery be prepared for Allen-Bradley 1756-L72?
Keep the validated project archive, supported firmware installer, controller and chassis records, and a verified Secure Digital recovery image. Test the restore and rollback procedure before the planned outage.
Is Allen-Bradley 1756-L72 immediately available because its lifecycle is Active Mature?
No. Active Mature is a Rockwell Automation lifecycle designation, not a promise of Apter inventory or immediate shipment. Current condition, quantity, price, and delivery must be confirmed when quoted.
What information should buyers provide when verifying an Allen-Bradley 1756-L72 replacement?
Provide the complete catalog number, Series A or Series B marking, firmware revision, chassis and communication-module list, current project size, motion scope, quantity, and delivery destination.

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