Allen-Bradley,1756-L1M2
Allen-Bradley,1756-L1M2
Allen-Bradley,1756-L1M2
Allen-Bradley,1756-L1M2
Allen-Bradley,1756-L1M2
Allen-Bradley,1756-L1M2
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1756-L1M2/A

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The Allen-Bradley 1756-L1M2/A is a ControlLogix 5550 controller. It can control local and remote I/O via DeviceNet, ControlNet, and universal remote I/O networks.
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Technical specifications for 1756-L1M2/A

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L1M2/A
  • Product Family:
    ControlLogix
  • Isolation Voltage:
    30 Volts Continuous
  • Operating Temperature:
    0 … 60 °C (32…140 °F)
  • Storage Temperature:
    -40… 85 °C (-40…185 °F)
  • Emissions:
    Group 1, Class A
  • Vibration:
    2 g @ 10…500 Hz
  • Weight:
    0.3 kg
  • Estimated shipping dimensions:
    5.1x 15.2x 15.2 cm
  • 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 Specifications Operating Environment Monitoring & Control Applications

Features:

  • 1MB Volatile User Memory
  • Broad Network Compatibility
  • Modular Communication Design
The Allen-Bradley 1756-L1M2/A features 1MB of battery-backed RAM, which provides a dedicated area for storing user programs and application data for high-speed logic operations.

This Allen-Bradley 1756-L1M2/A module is designed to control both local and remote I/O across various industrial networks, including DeviceNet, ControlNet, and Universal Remote I/O, ensuring flexible integration into complex automation architectures.

The Allen‑Bradley 1756‑L1M2/A features a flexible modular architecture that requires compatible communication modules (such as 1756-ENBT for Ethernet/IP or other network interface modules) to establish connectivity, allowing users to customize networking capabilities based on specific system integration requirements.

The 1756‑L1M2/A Allen-Bradley ControlLogix Processor Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
The Allen‑Bradley 1756‑L1M2/A ControlLogix Processor Module Manuals,Datasheets,Link 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.
The Allen‑Bradley 1756‑L1M2/A ControlLogix Processor Module

General

  • Manufacturer Allen-Bradley
  • Model 1756‑L1M2/A
  • Condition New Original ready stock
  • Product Family 1756-L1M1,1756-L1M2,1756-L1M3
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.
  • Temperature range – Operates from 0°C to 60°C (32 °F to 140 °F); storage from -40 °C to 85 °C (-40 °F to 185 °F).
  • Humidity and shock – Withstands 5–95% noncondensing humidity, 30 g operating shock, and 2 g vibration at 10‑500 Hz.
  • Electrical conditions – Requires an open‑style enclosure (no internal ingress protection); isolation voltage is 30V continuous.
  • Emissions and immunity – Group 1, Class A emissions; immunity includes 6 kV contact ESD and 10V/m radiated RF up to 1 GHz.
  • Network monitoring – Status of DeviceNet, ControlNet, and Universal Remote I/O links can be read via RSLogix 5000 diagnostics.
  • Battery and memory supervision – The software provides warnings when battery voltage is low; program checksums verify memory integrity.
  • Fault handling – Major recoverable faults are reported through the controller’s status LED and can be captured programmatically.
  • Live insertion – RIUP capability allows module replacement without powering down, but ESD procedures must be strictly followed.
  • Mixed‑network factories – Ideal for facilities that combine ControlNet for real‑time motion and DeviceNet for discrete sensors.
  • Retrofit projects – Direct replacement for older 1756‑L1 or 1756‑L1Mx controllers in existing ControlLogix 5550 chassis.
  • Battery‑backed control – Suitable for applications where a short power interruption cannot be tolerated, provided batteries are maintained.
  • Electrically noisy environments – Works near large motors, welders, or VFDs due to its high ESD and RF immunity ratings..
Description
The Allen‑Bradley 1756‑L1M2/A is a ControlLogix 5550 series processor module designed for industrial automation systems requiring deterministic control of local and distributed I/O. It supports multiple network protocols—including DeviceNet, ControlNet, and Universal Remote I/O—making it suitable for mixed‑architecture environments. With 1 MB of user memory and battery‑backed retention (using the 1756‑BA1 lithium battery), the module is intended for applications where program integrity during power loss is critical, even though it lacks built‑in nonvolatile storage.

The 1756‑L1M2/A offers high electromagnetic immunity—6 kV contact / 8 kV air discharge ESD protection, ±4 kV EFT/B on communication ports, and 10V/m radiated RF immunity up to 1 GHz—ensuring reliable operation near variable‑frequency drives or welding equipment. Its ability to operate across 0 to 60 °C and withstand 30 g shock allows deployment in moderately harsh industrial settings. Over the long term, the module’s support for multiple networks reduces the need for additional gateways, while its compatibility with RSLogix 5000 (v8.02.00 or later) simplifies programming and diagnostics. However, because it lacks nonvolatile memory, a disciplined battery maintenance schedule is essential to avoid program loss.
Revisions

Revision Part #

Also known as

1756-L1M2 Ser A
1756-L1M2/A, Series A, Rev A
Alternative Names
1756-L1 1756-L1M1 1756-L1M2 1756-L1M3
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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 the 1756‑L1M2/A be installed in a chassis that is already powered on?
Yes, the module supports RIUP (Removing/Inserting Under Power), allowing replacement or addition without shutting down the entire system. However, you must follow electrostatic discharge (ESD) prevention procedures to avoid damaging sensitive components.
What are the restrictions on operating temperature and humidity?
The module must be used in an environment where the ambient temperature stays between 0 °C and 60 °C (32 °F to 140 °F), with relative humidity from 5% to 95% noncondensing. Operating outside these ranges may cause erratic behavior or permanent damage.
Does the module log faults or events automatically for later analysis?
The controller itself does not have an onboard event log; fault and status information is accessible through RSLogix 5000 software. You can configure the program to log specific events to a separate historian or SCADA system via ControlNet or DeviceNet.