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1756-L1M2

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Allen-Bradley 1756-L1M2 is a ControlLogix 5550 controller using a 1756-M2 1 MB memory module and a ControlLogix chassis.
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Technical specifications for 1756-L1M2

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L1M2
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 5550 Controller with 1756-M2 1 MB Memory
  • Stock:
    1
  • Memory module:
    1756-M2, 1 MB
  • Backplane current at 5.1 V:
    1.05 A
  • Backplane current at 24 V:
    0.02 A
  • Power dissipation:
    4.8 W
  • Thermal dissipation:
    16.4 BTU/hr
  • Operating temperature:
    0–60 °C
  • Storage temperature:
    -40–85 °C
  • Relative humidity:
    5–95%, noncondensing
  • Vibration:
    2 g
  • I/O memory:
    150 KB
  • Local programming cable:
    1756-CP3 or 1747-CP3
  • Enclosure requirement:
    Open-style equipment; install in an enclosure appropriate to the environment
  • 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 Chassis Power Project Recovery Application
  • ControlLogix 5550 controller used with the 1756-M2 1 MB memory module
  • No embedded Ethernet capability is established by the reviewed controller documentation
  • Project, communications and chassis record are essential replacement items

1756-L1M2 is a ControlLogix 5550 controller configured around the removable 1756-M2 1 MB memory module.

It is a chassis controller, so the original rack and communication design—not just the processor label—determine the system it can restore.

Safeguard the application backup and verify the memory module, power budget and communication modules before any exchange.

Availability, condition, price, and shipping time for 1756-L1M2 are confirmed during quotation.

Allen-Bradley 1756-L1M2 ControlLogix Memory Board 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.

  • Verify the installed 1756-M2 1 MB memory module before quoting a replacement
  • Preserve the controller project before removing the original CPU
  • Do not substitute memory hardware from label similarity alone
  • Include the documented 5.1 V and 24 V backplane current in the rack budget
  • Check the loaded supply with every I/O and communication module installed
  • Investigate chassis power faults before replacing a controller repeatedly
  • Archive the application, slot layout and communication configuration
  • Identify the actual programming and network access route before removal
  • Validate I/O ownership and system behavior under controlled conditions after restore
  • ControlLogix 5550 machine-control projects sized within the 1 MB user-memory and 150 KB I/O-memory limits
  • Chassis-based sequential and process-control systems using compatible ControlLogix I/O modules
  • Networked controller installations using separate compatible ControlLogix communication modules
Description
1756-L1M2 is an Allen-Bradley ControlLogix 5550 controller used with the 1756-M2 1 MB memory module.

The controller has no embedded Ethernet port; its installed communications, memory module and chassis configuration determine how it is used in the existing automation system.

Before replacement, capture the controller label, memory module, rack layout, communication path and project backup. These legacy components must be matched as a configuration, not by processor appearance.
Revisions

Revision Part #

Also known as

1756-L1M2 Ser A
1756-L1M2/A, Series A, Rev A
Alternative Names
1756-L1M2 1756 L1M2 Allen Bradley 1756-L1M2 Allen-Bradley 1756-L1M2 ControlLogix 1756-L1M2
Technical notes
1756-L1M2 must be matched with its 1756-M2 memory module, saved project, chassis layout and installed communications path before replacement.
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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.
Does 1756-L1M2 include the required memory module?
The catalog identity is documented with a 1756-M2 1 MB memory module. Verify the installed memory hardware and the saved project before ordering a controller replacement.
Can 1756-L1M2 connect directly to Ethernet?
No embedded Ethernet interface is established by the reviewed controller documentation. Identify the actual communication module or gateway in the chassis before planning access or replacement.
Why can a replacement 1756-L1M2 power up but not run the plant?
The retained controller project, communications configuration, memory module and chassis I/O ownership must agree. Power-up alone does not restore the original control system.
What should be backed up before replacing 1756-L1M2?
Preserve the application project, firmware/revision information, 1756-M2 identity, chassis slot layout and all network path information. Take a labeled photograph of the original installation.
Can 1756-L1M2 be replaced by another ControlLogix controller only by matching memory size?
No. Communication capability, controller generation, project support and chassis integration also require review. A similar memory quantity does not establish direct compatibility.
Why does 1756-L1M2 require a chassis current check?
The controller draws documented 5.1 V and 24 V backplane current. Recalculate the loaded chassis supply with all installed modules before returning the rack to service.
Is the 1756-L1M2 suitable for a new ControlLogix project?
Treat it as a legacy installed-base controller. Confirm current Rockwell support, software and replacement strategy before committing it to a new project.