AB 1756-L55M22
AB 1756-L55M22
AB 1756-L55M22
AB 1756-L55M22
AB 1756-L55M22
AB 1756-L55M22
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    Discontinued

1756-L55M22

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Allen-Bradley 1756-L55M22 combines 750 KB of working memory with 750 KB of onboard nonvolatile memory for supported ControlLogix 5555 systems.
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Ships by Wednesday, October 28
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Technical specifications for 1756-L55M22

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L55M22
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 5555 Controller, 750 KB Data/Logic and 750 KB Nonvolatile Memory
  • Stock:
    1
  • Data and logic memory:
    750 KB
  • I/O memory:
    208 KB
  • Nonvolatile memory:
    750 KB
  • 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 Nonvolatile Memory Revision 11 Redundancy Service Hardware Application
  • 750 KB data and logic memory paired with 750 KB nonvolatile memory
  • Different project-retention identity from the volatile-memory 1756-L55M12
  • Listed in the documented ControlLogix Revision 11 redundancy scope

1756-L55M22 is a ControlLogix 5555 controller with matched 750 KB working and nonvolatile memory allocations.

The onboard nonvolatile memory supports project storage and recovery but does not replace a controlled external project archive.

Verify Series A identity, stored-image status, firmware, battery, and Revision 11 redundancy compatibility before replacement.

Availability, condition, price, and shipping time for 1756-L55M22 are confirmed during quotation.

Allen-Bradley 1756-L55M22 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.

  • 750 KB working memory is paired with 750 KB nonvolatile memory
  • The stored project must be checked for revision and load behavior
  • An external controlled project archive remains required
  • 1756-L55M22 is listed in the documented Revision 11 redundancy scope
  • The partner controller and redundancy modules must use approved revisions
  • Verify synchronization and stored-project behavior before production
  • 1756-BA1 is the documented controller battery
  • 1756-CP3 or 1747-CP3 supports the local serial programming connection
  • Communication networks require separate compatible ControlLogix modules
  • ControlLogix 5555 applications requiring matched working and nonvolatile project memory
  • Revision 11 redundant controller systems using the approved hardware combination
  • Chassis-based machine and process-control systems with separate network modules
Description
1756-L55M22 is an Allen-Bradley ControlLogix 5555 controller with 750 KB data and logic memory plus 750 KB of nonvolatile memory.

Unlike the M12 allocation, the M22 model has documented nonvolatile memory. This makes exact controller identity important when recovering a legacy application.

Check the saved project, installed revision, chassis inventory and any documented redundancy arrangement before replacement.
Revisions

Revision Part #

Also known as

1756-L55M22 Ser A
1756-L55M22/A, Series A, Rev A
Alternative Names
1756-L55M22 1756 L55M22 Allen-Bradley 1756-L55M22 Allen Bradley 1756-L55M22 ControlLogix 1756-L55M22
Technical notes
1756-L55M22 combines 750 KB data/logic memory with 750 KB nonvolatile memory; protect the application archive and verify any redundancy 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.
Why is Allen-Bradley 1756-L55M22 not the same replacement as 1756-L55M12?
Allen-Bradley 1756-L55M22 has documented 750 KB nonvolatile memory, whereas the M12 configuration does not. That distinction affects recovery and must be preserved.
What recovery safeguards should be prepared before servicing Allen-Bradley 1756-L55M22?
Keep an independently verified project archive, controller identity record, firmware details, chassis inventory, communications configuration, and documented restoration test before removing or reloading Allen-Bradley 1756-L55M22.
Is Allen-Bradley 1756-L55M22 identified for ControlLogix redundancy?
Rockwell release information identifies Allen-Bradley 1756-L55M22 in a Revision 11 redundancy context. Verify the exact system release and partner configuration before use.
How does the nonvolatile memory in Allen-Bradley 1756-L55M22 behave during normal operation?
The controller executes the active project from working memory; the separate 750 KB nonvolatile area stores a recoverable image. It is not additional runtime memory and must not be counted as extra project capacity.
When should the stored image in Allen-Bradley 1756-L55M22 be updated?
Update it only after the running project has been approved and backed up externally. Confirm firmware, revision, load-on-power-up, and load-on-corruption settings so an older image cannot overwrite a validated project.
Why might Allen-Bradley 1756-L55M22 fail to synchronize in a redundant system?
Check both controller catalog numbers and revisions, firmware, redundancy-module revisions, chassis arrangement, project images, and synchronization status against the applicable Revision 11 documentation.
Does Allen-Bradley 1756-L55M22 provide an onboard network port for plant communications?
No onboard network interface should be assumed. Identify and validate the separate ControlLogix communication modules, network addresses, produced and consumed tags, and redundancy paths used by the installed chassis.

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