1756-L55M16
1756-L55M16
1756-L55M16
1756-L55M16
1756-L55M16
1756-L55M16
Ask our team:
  • Phone: +86 181 0690 9650
  • E-Mail sales1@apterpower.com
  • Lifecycle status

    Lifecycle status:
    Discontinued

1756-L55M16

/ 4.9
1001 reviews | Need a Specific Revision?
Allen-Bradley 1756-L55M16 is a ControlLogix 5555 controller with 7.5 MB data and logic memory for larger legacy applications.
In Stock
Ships by Thursday, October 29
Fast Shipping Available
Get a quick price for 1756-L55M16
Quantity
*E-mail
Company
*Mobile
*Content
Upload (gif, jpg, jpeg, png, bmp, doc, docx, xls, xlsx, ppt, pdf, csv)

Technical specifications for 1756-L55M16

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L55M16
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 5555 Controller, 7.5 MB Data and Logic Memory
  • Stock:
    1
  • Data and logic memory:
    7.5 MB data and logic memory; maximum 3.5 MB data
  • I/O memory:
    208 KB
  • Backplane current at 5.1 V:
    1.48 A
  • Backplane current at 24 V:
    0.014 A
  • Power dissipation:
    6.3 W
  • Thermal dissipation:
    21.5 BTU/hr
  • Operating temperature:
    0–60 °C
  • Storage temperature:
    -40–85 °C
  • Relative humidity:
    5–95%, noncondensing
  • Weight:
    0.38 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 Chassis Power Project Recovery Application
  • 7.5 MB total data and logic memory with a maximum of 3.5 MB available for data
  • 208 KB I/O memory and no listed onboard nonvolatile memory
  • Higher chassis-current demand than the lower-memory L55 configurations

1756-L55M16 is the highest-capacity memory configuration listed for the ControlLogix 5555 controller family.

The 7.5 MB total is qualified by a 3.5 MB maximum for data, so project composition—not only total size—must be checked.

Preserve the project archive and verify Series A identity, firmware, battery, and full chassis-power margin before replacement.

Availability, condition, price, and shipping time for 1756-L55M16 are confirmed during quotation.

Allen-Bradley 1756-L55M16 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.

  • 7.5 MB is the total published data and logic memory
  • Data usage is limited to a maximum of 3.5 MB
  • 208 KB is separately allocated to I/O data
  • The controller draws 1.48 A at 5.1 V DC from the backplane
  • The documented 24 V DC backplane demand is 14 mA
  • Calculate margin using every module installed in the chassis
  • No onboard nonvolatile memory is listed for the M16 allocation
  • Retain a verified project archive containing all controller and network configuration
  • Confirm battery condition before shutdown or controller removal
  • Large ControlLogix 5555 machine-control projects within the documented memory allocation
  • Process and sequential-control systems requiring more logic capacity than lower-memory L55 controllers
  • Supported redundant-controller systems using the approved firmware and hardware combination
Description
1756-L55M16 is an Allen-Bradley ControlLogix 5555 controller with 7.5 MB data and logic memory.

The published M16 configuration has 208 KB I/O memory and no nonvolatile memory. Its larger application memory does not remove the need for a verified project archive.

Before replacement, retain the project, identify every chassis communication path and check the chassis power margin with the full module load.
Revisions

Revision Part #

Also known as

1756-L55M16 Ser A
1756-L55M16/A, Series A, Rev A
Alternative Names
1756-L55M16 1756 L55M16 Allen-Bradley 1756-L55M16 Allen Bradley 1756-L55M16 ControlLogix 1756-L55M16
Technical notes
1756-L55M16 has 7.5 MB data and logic memory with no published nonvolatile memory; safeguard the project and verify chassis power.
Exceptional Service

Our Mission

  • 100% Satisfaction

    We believe expertise is priceless. With over 20 years of experience, and top engineers on staff, we can help you solve or avoid problems that threaten your business.
  • Trust Guaranteed

    Not only do we have a vast inventory, our team makes sure every piece of equipment is in working condition. Your purchases are also backed by our Warranty.
  • Expertise

    Time is money, especially when your equipment is down. We work quickly to get your equipment on its way so you can get it back up and running.

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 all 7.5 MB of Allen-Bradley 1756-L55M16 memory be used for data?
No. Rockwell specifies a maximum of 3.5 MB for data, so review the project’s data and logic allocation separately.
What backup and recovery controls should accompany Allen-Bradley 1756-L55M16 service?
Maintain an independent project archive, controller identity record, firmware information, chassis inventory, communications configuration, and tested recovery procedure before removing or reloading Allen-Bradley 1756-L55M16.
What must be checked before installing Allen-Bradley 1756-L55M16 in an existing chassis?
Verify chassis power budget, slot assignment, keying, firmware compatibility, network modules, I/O ownership, and project revision before energizing Allen-Bradley 1756-L55M16.
Why can Allen-Bradley 1756-L55M16 overload a chassis that operated with a smaller L55 controller?
Its documented 5.1 V DC backplane demand is 1.48 A. Recalculate the complete chassis load before substitution.
Why can Allen-Bradley 1756-L55M16 restart but not communicate correctly?
Network functionality depends on installed communication modules and restored project configuration, not controller memory size alone. Validate the complete communication path after installing Allen-Bradley 1756-L55M16.
What identification should buyers provide when requesting Allen-Bradley 1756-L55M16?
Provide complete label photos, controller revision, installed chassis and communication modules, project requirements, firmware record, and replacement reason so Allen-Bradley 1756-L55M16 compatibility can be confirmed.
What recovery limitation matters most when servicing Allen-Bradley 1756-L55M16?
The M16 configuration has no listed onboard nonvolatile memory, so retain a verified project archive and confirm battery condition before shutdown.