AB 1756-L55M23
AB 1756-L55M23
AB 1756-L55M23
AB 1756-L55M23
AB 1756-L55M23
AB 1756-L55M23
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  • Lifecycle status

    Lifecycle status:
    Discontinued

1756-L55M23

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Allen-Bradley 1756-L55M23 provides matched 1.5 MB working and nonvolatile memory for Series A ControlLogix 5555 applications.
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Ships by Wednesday, October 28
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Technical specifications for 1756-L55M23

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L55M23
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 5555 Controller, 1.5 MB Data/Logic and 1.5 MB Nonvolatile Memory
  • Stock:
    1
  • Data and logic memory:
    1.5 MB
  • I/O memory:
    208 KB
  • Nonvolatile memory:
    1.5 MB
  • Backplane current at 5.1 V:
    1.23 A
  • Backplane current at 24 V:
    0.014 A
  • Power dissipation:
    5.6 W
  • Thermal dissipation:
    19.1 BTU/hr
  • Operating temperature:
    0–60 °C
  • Storage temperature:
    -40–85 °C
  • Relative humidity:
    5–95%, noncondensing
  • Weight:
    0.35 kg
  • 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 Memory Identity Redundancy Compatibility Service Hardware Application
  • 1.5 MB data and logic memory paired with 1.5 MB nonvolatile memory
  • Series A identity must match the installed controller and saved project
  • Supported redundancy use depends on the documented firmware combination

1756-L55M23 is a ControlLogix 5555 controller with matched 1.5 MB working and nonvolatile memory allocations.

Its stored-image behavior and memory identity are different from both the lower-capacity M22 and volatile-memory configurations.

Confirm Series A marking, stored project, firmware, battery, chassis power, and redundancy compatibility before replacement.

Availability, condition, price, and shipping time for 1756-L55M23 are confirmed during quotation.

Allen-Bradley 1756-L55M23 ControlLogix 5555 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.

  • 1.5 MB is allocated to data and logic memory
  • 1.5 MB of matched nonvolatile memory is also documented
  • Stored-image revision and load settings must be checked before startup
  • Use only firmware releases that explicitly include 1756-L55M23
  • Match the primary and secondary controller hardware and firmware
  • Verify redundancy-module compatibility before synchronization
  • 1756-BA1 is the documented controller battery
  • 1756-CP3 or 1747-CP3 is used for the local serial connection
  • Network operation depends on separate compatible communication modules
  • ControlLogix 5555 applications requiring 1.5 MB working and nonvolatile project memory
  • Supported redundant-controller installations using approved matching firmware
  • Chassis-based machine and process-control systems with separate network interfaces
Description
1756-L55M23 is an Allen-Bradley ControlLogix 5555 controller with 1.5 MB data and logic memory and 1.5 MB nonvolatile memory.

The M23 controller is not interchangeable with L55 versions that use different volatile or nonvolatile-memory allocations. Confirm the saved application and exact controller identity.

Before replacement, document controller revision, chassis layout, communications and the recovery path for the approved project.
Revisions

Revision Part #

Also known as

1756-L55M23 Ser A
1756-L55M23/A, Series A, Rev A
Alternative Names
1756-L55M23 1756 L55M23 Allen-Bradley 1756-L55M23 Allen Bradley 1756-L55M23 ControlLogix 1756-L55M23
Technical notes
1756-L55M23 has 1.5 MB data/logic and 1.5 MB nonvolatile memory; match the exact revision and retain an independent project backup.
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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.
What must be verified before selecting Allen-Bradley 1756-L55M23 for a ControlLogix replacement?
Confirm controller family, chassis, firmware compatibility, project memory needs, communication modules, I/O architecture, and licensing requirements for the installed machine.
Can Allen-Bradley 1756-L55M23 replace a different L55M memory version directly?
No. Match volatile memory, nonvolatile memory, application size, firmware, and complete system configuration before approving the replacement.
Why should Allen-Bradley 1756-L55M23 still have an external project backup?
Nonvolatile memory does not replace a controlled backup and recovery record. Retain the approved project independently before service.
What project checks are required before moving an existing application into Allen-Bradley 1756-L55M23?
Verify that the complete project fits the documented 1.5 MB working-memory allocation, then check firmware, I/O configuration, communication modules, motion content, and any redundancy requirements before download.
How can a buyer confirm that a surplus controller is Allen-Bradley 1756-L55M23 Series A?
Require a clear nameplate showing the complete catalog and series, and match it with the firmware record and chassis documentation. Do not identify the controller from an L55 family marking or seller description alone.
What can cause Allen-Bradley 1756-L55M23 to load an unexpected project after a power cycle?
A stored nonvolatile image and its load-on-power-up or load-on-corruption settings can replace the downloaded project. Compare the stored image with the approved archive before returning the controller to service.
What is needed for a local serial service connection to Allen-Bradley 1756-L55M23?
Use the documented controller serial connection with a compatible 1756-CP3 or 1747-CP3 cable and the correct programming software. Confirm the cable and 1756-BA1 battery separately because neither should be assumed included.

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