AB 1756-L55M14
AB 1756-L55M14
AB 1756-L55M14
AB 1756-L55M14
AB 1756-L55M14
AB 1756-L55M14
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1756-L55M14

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Allen-Bradley 1756-L55M14 is a 3.5 MB ControlLogix 5555 controller with 208 KB I/O memory and no listed onboard nonvolatile memory.
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Technical specifications for 1756-L55M14

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L55M14
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 5555 Controller, 3.5 MB Data and Logic Memory
  • Stock:
    1
  • Data and logic memory:
    3.5 MB
  • I/O memory:
    208 KB
  • Backplane current at 5.1 V:
    1.25 A
  • Backplane current at 24 V:
    0.014 A
  • Power dissipation:
    5.7 W
  • Thermal dissipation:
    19.4 BTU/hr
  • Operating temperature:
    0–60 °C
  • Storage temperature:
    -40–85 °C
  • Relative humidity:
    5–95%, noncondensing
  • Dimensions:
    3.5 x 14 x 14.5 cm
  • Weight:
    0.36 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 Allocation Project Retention Installation Limits Application
  • Match 1756-L55M14 to its documented Series A ControlLogix 5555 hardware configuration
  • Confirm the controller firmware is compatible with the installed RSLogix 5000 software
  • Preserve the controller project and verify the memory board, battery, chassis, and serial connection before replacement

1756-L55M14 is an Allen-Bradley Series A ControlLogix 5555 controller supplied as a documented controller-and-memory-board catalog configuration.

The 1756-L55M14 configuration must be matched by exact catalog number, installed Series, controller firmware, memory allocation, and RSLogix 5000 compatibility. Chassis fit alone does not establish interchangeability with another ControlLogix 5555 controller.

Before servicing 1756-L55M14, retain the complete controller project and record the installed firmware, memory-board configuration, 1756-BA1 battery condition, chassis power, communication modules, and serial programming connection.

Availability, condition, price, and shipping time for 1756-L55M14 are confirmed during quotation.

Allen-Bradley 1756-L55M14 ControlLogix Controller Manuals, Product Family, 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.

  • 3.5 MB is available for controller data and logic
  • 208 KB is reserved for I/O data
  • The M14 table does not list onboard nonvolatile memory
  • Maintain a verified external copy of the complete controller project
  • Record firmware and communication-module configuration with the archive
  • Confirm 1756-BA1 battery condition before removing power
  • Install the open-style controller in a suitable industrial enclosure
  • Check the loaded chassis against the 1.25 A demand at 5.1 V DC
  • Apply the documented pollution-degree, overvoltage-category, and altitude limits
  • ControlLogix 5555 machine-control projects requiring up to 3.5 MB of data and logic memory
  • Chassis-based process and sequential-control systems using ControlLogix I/O
  • Supported redundant-controller installations using the approved firmware combination
Description
1756-L55M14 is an Allen-Bradley ControlLogix 5555 controller with 3.5 MB of data and logic memory.

The published M14 allocation provides 208 KB I/O memory and no nonvolatile memory; replacement planning therefore begins with the saved project and the exact controller configuration.

Check the loaded chassis, installed communications and application revision before selecting a replacement controller.
Revisions

Revision Part #

Also known as

1756-L55M14 Ser A
1756-L55M14/A, Series A, Rev A
Alternative Names
1756 L55M14 Allen-Bradley 1756-L55M14 Allen Bradley 1756-L55M14 ControlLogix 1756-L55M14 1756-L55M14 ControlLogix 1756-L55M14 1756L55M14 Rockwell Automation 1756-L55M14
Technical notes
1756-L55M14 has 3.5 MB data and logic memory, 208 KB I/O memory and no published nonvolatile memory; keep a validated project archive.
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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 distinguishes 1756-L55M14 from lower-memory 1756-L55 controllers?
1756-L55M14 has 3.5 MB data and logic memory and 208 KB I/O memory. Confirm the saved application memory requirement rather than selecting by processor appearance.
Does 1756-L55M14 retain an application without an external backup?
The published M14 allocation has no nonvolatile memory. Preserve a validated project archive before service or replacement.
Why can a 1756-L55M14 replacement produce different I/O behavior?
Controller project revision, chassis module inventory and communication configuration govern I/O ownership. Restore the correct project and validate the I/O tree.
Does Allen-Bradley 1756-L55M14 retain the application if its battery and project archive are unavailable?
Do not assume it will. The M14 configuration has no listed onboard nonvolatile memory, so a verified external project archive and serviceable battery are essential.
What chassis-power check is required for Allen-Bradley 1756-L55M14?
Include its documented 1.25 A demand at 5.1 V DC and 14 mA demand at 24 V DC in the complete loaded-chassis calculation.
Can Allen-Bradley 1756-L55M14 be installed without an industrial enclosure?
No. It is open-style equipment and must be installed in an enclosure suitable for the site and the documented environmental limits.
Can any ControlLogix firmware be loaded into Allen-Bradley 1756-L55M14?
No. Confirm Series A identity, the supported firmware path, project revision and any redundancy requirements before updating or downloading.