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1756-L55M12

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1001 reviews | Need a Specific Revision?
Allen-Bradley 1756-L55M12 is a volatile-memory ControlLogix 5555 controller qualified for specified Revision 11 redundant systems.
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Technical specifications for 1756-L55M12

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L55M12
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 5555 Controller, 750 KB Data and Logic Memory
  • Stock:
    1
  • Data and logic memory:
    750 KB
  • I/O memory:
    208 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 Memory Retention Revision 11 Redundancy Service Hardware Application
  • 750 KB data and logic memory with 208 KB reserved I/O memory
  • No onboard nonvolatile project memory is listed for the M12 configuration
  • Supported in the documented ControlLogix redundancy Revision 11 configuration

1756-L55M12 is a ControlLogix 5555 controller with 750 KB of data and logic memory.

Unlike the 1756-L55M22 configuration, 1756-L55M12 does not include documented onboard nonvolatile memory. Project recovery therefore depends on a maintained engineering archive and the condition of the controller battery.

Before replacement, confirm the Series A identity, firmware revision, redundancy-partner compatibility, chassis power capacity, and saved controller project.

Availability, condition, price, and shipping time for 1756-L55M12 are confirmed during quotation.

Allen-Bradley 1756-L55M12 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 is allocated to data and logic and 208 KB is allocated to I/O
  • No onboard nonvolatile memory is listed for the 1756-L55M12 allocation
  • A current external project archive is required for dependable recovery
  • 1756-L55M12 is listed in the documented ControlLogix Revision 11 redundancy scope
  • Primary and secondary controllers must use the approved redundancy combination
  • Firmware and redundancy-module compatibility must be verified before synchronization
  • 1756-BA1 is the documented controller battery
  • 1756-CP3 or 1747-CP3 is used for the local serial programming connection
  • Network connectivity depends on separate compatible ControlLogix communication modules
  • ControlLogix 5555 machine and process-control projects within the M12 memory limits
  • Revision 11 redundant ControlLogix systems using the approved controller combination
  • Chassis-based automation systems using separate ControlLogix network interfaces
Description
1756-L55M12 is an Allen-Bradley ControlLogix 5555 controller with 750 KB of data and logic memory and 208 KB of I/O memory.

The M12 allocation does not include the onboard nonvolatile memory documented for the M22 version; Rockwell also lists the model in the specified Revision 11 redundancy release.

Retain the project archive and verify firmware, battery, chassis power, communication modules and redundancy-partner revision before installation.
Revisions

Revision Part #

Also known as

1756-L55M12 Ser A
1756-L55M12/A, Series A, Rev A
Alternative Names
1756-L55M12 1756 L55M12 Allen-Bradley 1756-L55M12 Allen Bradley 1756-L55M12 ControlLogix 1756-L55M12
Technical notes
1756-L55M12 has 750 KB data and logic memory with no published nonvolatile memory; preserve the project and verify any redundancy configuration.
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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 1756-L55M12 replace 1756-L55M22 without project review?
No. 1756-L55M12 is documented without nonvolatile memory, while the M22 configuration includes it. Preserve the original project and check how it is retained before replacement.
What is the most important memory distinction for 1756-L55M12?
The controller has 750 KB data and logic memory but no published nonvolatile memory. Do not assume the replacement unit contains a retained project image.
Can 1756-L55M12 be used in a redundant ControlLogix system?
Rockwell release information identifies 1756-L55M12 in a Revision 11 redundancy context. Confirm the exact redundancy release, partner controller and system configuration before service.
Can Allen-Bradley 1756-L55M12 recover its application without an external project archive?
Do not rely on that. The M12 configuration has no listed onboard nonvolatile memory, so retain a verified project archive and confirm battery condition before service.
Can Allen-Bradley 1756-L55M12 be installed in any ControlLogix redundant pair?
No. Rockwell documents it within a specific Revision 11 redundancy scope; controller firmware, partner controller and redundancy modules must match the approved combination.
Which service accessories should be identified when ordering Allen-Bradley 1756-L55M12?
Confirm whether the 1756-BA1 battery and 1756-CP3 or 1747-CP3 serial programming cable are required, because they should not be assumed included.
Why is Allen-Bradley 1756-L55M12 not interchangeable with 1756-L55M22?
The M12 lacks the onboard nonvolatile-memory allocation listed for the M22. Project-retention behavior, firmware and redundancy compatibility must therefore be reviewed separately.