Allen-Bradley,1756-L55M12
Allen-Bradley,1756-L55M12
Allen-Bradley,1756-L55M12
Allen-Bradley,1756-L55M12
Allen-Bradley,1756-L55M12
Allen-Bradley,1756-L55M12
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1756-L55M12/A

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The Allen‑Bradley 1756‑L55M12/A ControlLogix Processor Module is a member of the ControlLogix 5555 series, designed for mid‑range programmable automation control.
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Technical specifications for 1756-L55M12/A

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L55M12/A
  • Product Family:
    ControlLogix
  • Temperature, operating:
    0 … 60 °C (32…140 °F)
  • Temperature, storage:
    -40… 85 °C (-40…185 °F)
  • Relative humidity:
    5…95% noncondensing
  • Vibration:
    2 g @ 10…500 Hz
  • Shock, operating:
    30g
  • Shock, nonoperating:
    50g
  • Weight:
    0.34 kg
  • Estimated shipping dimensions:
    3.5x14x14.5cm
  • 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 Diagnostics Monitoring Applications

Features:

  • Optimized Mid‑Range Memory Architecture
  • Multi‑Protocol Industrial Network Support
  • Robust Environmental and Electrical Performance
The Allen‑Bradley 1756‑L55M12/A ControlLogix Controller and Memory Board provides a balanced memory configuration of 750 kbytes for logic and data plus 208 kbytes of dedicated I/O memory. This targeted capacity is ideal for mid‑sized automation tasks such as machine control, batch processing, and material handling, allowing engineers to avoid over‑specifying while still meeting performance requirements.

The Allen‑Bradley 1756‑L55M12/A ControlLogix Controller and Memory Board supports ControlNet, EtherNet/IP, DH+, DeviceNet, and universal remote I/O networks. This flexibility enables seamless integration into both new and existing Rockwell Automation architectures, reducing the need for additional communication adapters and simplifying system design for engineering teams.

The Allen‑Bradley 1756‑L55M12/A ControlLogix Controller and Memory Board operates reliably across a wide temperature range (0…60 °C) and humidity range (5…95% noncondensing), with 30 g operating shock and 2 g vibration tolerance. It draws only 1.23 A at 5.1V DC and dissipates 5.6 W, making it an energy‑efficient choice for industrial control panels without active cooling.

The 1756-L55M12/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‑L55M12/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‑L55M12/A ControlLogix Processor Module and Memory Board

General

  • Manufacturer Allen-Bradley
  • Model 1756-L55M12/A
  • Condition New Original ready stock
  • Product Family 1756-L55M13,1756-L55M14,1756-L55M16
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 1756-L55M12/A provides built-in diagnostic indicators for quick status monitoring. These LEDs help technicians identify faults efficiently.
  • Advanced fault detection capabilities allow early identification of system issues. This minimizes downtime and prevents unexpected failures.
  • The controller supports diagnostic messaging through programming software. Engineers can access detailed system logs for troubleshooting.
  • Self-check mechanisms ensure the module operates within safe parameters. This improves long-term reliability.
  • Real-time monitoring is enabled through compatible software tools. Users can track system performance continuously.
  • The controller provides data access for process optimization. This supports improved production efficiency.
  • Remote monitoring capabilities allow off-site diagnostics. This reduces maintenance response time.
  • System variables and I/O status can be visualized easily. This enhances operational transparency.
  • Suitable for manufacturing automation systems. It controls production lines efficiently.
  • Used in process industries such as oil and gas. It supports complex control strategies.
  • Ideal for material handling systems. It ensures precise coordination of equipment.
  • Applicable in power generation and utilities. It provides reliable system control.
Description
The Allen‑Bradley 1756‑L55M12/A ControlLogix Processor Module supports multiple network protocols, including ControlNet, EtherNet/IP, DH+, DeviceNet, and universal remote I/O networks. This flexibility allows it to integrate seamlessly into diverse automation architectures. When used in a redundant controller system, this model requires a ControlNet network to operate properly.

The Allen‑Bradley 1756‑L55M12/A ControlLogix Processor Module draws a backplane current of 1.23 A at 5.1V DC and 0.014 A at 24V DC. It dissipates 5.6 W of power, corresponding to a thermal dissipation of 19.1 BTU/hr. Its operating temperature ranges from 0 °C to 60 °C (32…140 °F), while storage temperatures span –40 °C to 85 °C (–40…185 °F). Relative humidity can be 5…95% noncondensing, and it withstands operating shocks of 30 g, non‑operating shocks of 50 g, and vibrations of 2 g at 10…500 Hz.

The Allen‑Bradley 1756‑L55M12/A ControlLogix Processor Module provides conducted RF immunity of 10V rms with a 1 kHz sine wave 80% AM from 150 kHz to 80 MHz. It has a continuous isolation voltage of 30V (basic insulation type) and has been type‑tested to withstand 707V DC for 60 seconds. Communication ports are classified as wiring category 2, and the controller is compatible with either the 1756‑CP3 or 1747‑CP3 serial programming cable.

Revisions

Revision Part #

Also known as

1756-L55M12 Ser A
1756-L55M12/A, Series A, Rev A
Alternative Names
1756-L55MI2 1756L55M12 1756L55MI2 I756-L55M12
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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 memory configuration does the Allen‑Bradley 1756‑L55M12/A offer, and is it suitable for mid‑sized control applications?
The Allen‑Bradley 1756‑L55M12/A provides 750 kbytes of total memory for logic and data, plus 208 kbytes of dedicated I/O memory. While it does not include nonvolatile memory, this configuration is ideal for mid‑range programmable automation control tasks such as machine control, batch processing, and material handling. Engineers can efficiently manage typical logic and I/O requirements without over‑specifying memory.
What communication networks does the Allen‑Bradley 1756‑L55M12/A support, and how does that benefit system integration?
The Allen‑Bradley 1756‑L55M12/A supports ControlNet, EtherNet/IP, DH+, DeviceNet, and universal remote I/O networks. This multi‑protocol capability allows seamless integration into both new and existing Rockwell Automation architectures. For procurement teams, it reduces the need for additional communication adapters, lowering total system cost and simplifying spare parts management.
Can the Allen‑Bradley 1756‑L55M12/A be used in a redundant controller system?
Yes, the Allen‑Bradley 1756‑L55M12/A can be deployed in a redundant controller system, but only when both controllers are connected over a ControlNet network. This provides engineers with a cost‑effective redundancy solution for high‑availability applications. Procurement decision‑makers should note that no extra hardware modules are required beyond standard ControlNet communication components.
What are the power, thermal, and environmental specifications of the Allen‑Bradley 1756‑L55M12/A?
The Allen‑Bradley 1756‑L55M12/A draws 1.23 A at 5.1V DC and 0.014 A at 24V DC from the backplane. It dissipates 5.6 W of power (19.1 BTU/hr). Operating temperature ranges from 0…60 °C, storage from ‑40…85 °C, with 5…95% noncondensing humidity. These ratings ensure reliable operation in industrial control panels without active cooling, helping procurement reduce enclosure and HVAC costs.