Allen-Bradley 1756-L55M24
Allen-Bradley 1756-L55M24
Allen-Bradley 1756-L55M24
Allen-Bradley 1756-L55M24
Allen-Bradley 1756-L55M24
Allen-Bradley 1756-L55M24
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1756-L55M24

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The Allen-Bradley 1756-L55M24 ControlLogix5555 controller is a high-performance processor module designed for complex industrial automation systems, delivering fast execution, large I/O capacity, and flexible network integration. It supports multi-discipline control including discrete, motion, and process applications within a modular ControlLogix architecture.
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Technical specifications for 1756-L55M24

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L55M24
  • Product Family:
    ControlLogix
  • Memory:
    3.5 MB
  • Nonvolatile Memory:
    Yes
  • Backplane Current:
    5.1 V DC 1.25 A / 24V DC 0.014 A
  • Power Dissipation:
    5.7 W
  • Thermal Dissipation:
    19.4 BTU/hr
  • Maximum Analog I-O:
    4,000 Input, 2,000 Output
  • Program Scan Time:
    0.08 milliseconds
  • Vibration:
    2 g @ 10…500 Hz
  • Surge transient immunity:
    ±2 kV line earth (CM) on communications ports
  • Battery:
    1756-BA1 or 1756-BATM
  • Weight:
    0.3 kg
  • Estimated shipping dimensions:
    3.8x15.2x14cm
  • Tariff Code:
    8708709900
  • 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 Efficiency & Performance Certifications Application

Features:

  • High-Speed Processing Performance For Time-Critical Control Applications
  • Scalable I/O Capacity Supporting Large Distributed Automation Systems
  • Flexible Communication Integration Across Multiple Industrial Networks
The Allen-Bradley 1756-L55M24 controller plays a central role in ControlLogix systems by coordinating various automation processes within a single platform. Its modular architecture allows users to design systems that can evolve over time, adding or modifying modules without major redesign. This flexibility is particularly valuable in industries where system expansion or upgrades are frequent. The ability to install multiple controllers in one chassis further enhances system efficiency and segmentation of control tasks. This design reduces downtime and improves maintainability in complex operations.

From a performance standpoint, the controller is optimized for high-speed execution and large-scale data handling. The combination of fast scan time and significant memory capacity ensures smooth execution of advanced control algorithms. It is well-suited for applications requiring precise timing, such as motion control or synchronized operations. Additionally, its ability to manage a high volume of I/O points makes it ideal for large manufacturing lines or process plants. This balance of speed and capacity supports both current and future automation needs.

In terms of integration, the 1756-L55M24 offers extensive communication capabilities, making it adaptable to diverse industrial environments. With support for multiple network protocols through optional modules, it can easily connect with existing systems and devices. The inclusion of standard programming languages allows engineers to develop and maintain applications efficiently. Combined with robust environmental tolerance and reliable operation, this controller is widely used in industries such as manufacturing, energy, and process automation where performance and flexibility are critical.

The 1756-L55M24 Allen-Bradley ControlLogix5555 Controller may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1756-L55M24 ControlLogix5555 Controller 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.
Allen-Bradley 1756-L55M24 ControlLogix5555 Controller Specs

General

  • Manufacturer Allen-Bradley
  • Model 1756-L55M24
  • Condition New Original ready stock
  • Product Family 1756-L55M24A,1756-L55M23,1756-L55M14
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.
  • Large Memory Capacity: Equipped with 3.5 MB user memory. Compared to the M23 (1.5 MB), it can handle larger logic programs, more tag data, and complex recipe storage.
  • Parallel Task Processing: Supports 32 multitasking tasks (1 continuous task + 31 periodic/event tasks). This multitasking mechanism ensures that emergency control signals (such as safety shutdown) take precedence over normal logic.
  • High I/O throughput: Capable of simultaneously managing up to 128,000 digital and 4,000 analog I/Os. Its backplane communication speed is extremely fast, suitable for large-scale distributed I/O control.
  • Communication response efficiency: Built-in RS-232 port supports baud rates up to 38.4 Kbps. High-speed real-time data exchange with host computer (HMI/SCADA) can be achieved via Ethernet bridging module.
  • UL/cUL Certification: Complies with US UL 508 industrial control equipment standards and relevant Canadian safety standards.
  • CE Mark: Fully compliant with European Electromagnetic Compatibility (EMC) Directives and Low Voltage Directives, ensuring stable operation in environments with strong electrical interference.
  • Explosion-proof area standard: Certified as Class I, Division 2 (Groups A, B, C, D), allowing installation in hazardous locations with flammable gases or vapors.
  • Environmental tolerance standard: Complies with IEC 60068-2 standard, exhibiting extremely strong vibration resistance (2g @ 10-500Hz) and shock resistance.
  • Large-scale factory automation: Due to its large 3.5MB memory, it is commonly used in automotive body shops or final assembly lines, handling thousands of logical steps.
  • Complex process control (DCS level): Suitable for complex loop control in refineries and chemical plants, capable of storing large amounts of PID control parameters and historical trend records.
  • High-requirement redundant systems: As a core controller, it achieves hot standby redundancy through the 1756-RM/SRM module, widely used in critical areas where shutdown is not an option, such as turbine control in power plants.
  • Multi-axis synchronous motion control: Works with the in-rack servo control module for high-speed packaging machines, printing presses, or palletizing robots, enabling high-precision synchronous control of multiple axes.
Description
The Allen-Bradley 1756-L55M24 is a powerful processor module within the ControlLogix platform, engineered to handle demanding automation tasks with precision and speed. With 3.5 MB of non-volatile user memory, it eliminates the need for constant battery dependency while still supporting backup options such as the 1756-BA1 or 1756-BATM. Its program scan time of 0.08 milliseconds ensures rapid data processing, making it suitable for time-critical control environments.

Built for scalability, the controller supports up to 128,000 total I/O points, including 4,000 analog inputs and 2,000 analog outputs, allowing it to manage large and complex systems efficiently. The modular ControlLogix design enables installation in any chassis slot and supports multiple controllers within a single chassis, providing flexibility for distributed architectures. Compared to other models in the ControlLogix series, the 1756-L55M24 offers a balanced combination of memory capacity and processing speed for mid-to-high range applications.

The module features an integrated RS-232 serial communication port and supports a wide range of optional communication modules such as Ethernet, DeviceNet, ControlNet, DH+, SynchLink, and Remote I/O. This flexibility allows seamless integration with various industrial networks. It also supports multiple programming languages, including relay ladder logic, structured text, function block, and sequential function charts, enabling engineers to select the most suitable method for their application.

Designed for industrial environments, the controller operates reliably within a temperature range of 0 to 60°C and humidity levels of 5–95% non-condensing. It withstands 2 g vibration (10…500 Hz) and offers ±2 kV surge transient immunity on communication ports, ensuring stable performance in harsh conditions. With a power dissipation of 5.7 W and thermal dissipation of 19.4 BTU/hr, it maintains efficient energy usage while delivering consistent performance.
Revisions

Revision Part #

Also known as

1756-L55M24 Ser A
1756-L55M24/A, Series A, Rev A
Alternative Names
1756-L55 1756-L55M12 1756-L55M13 1756-L55M13A 1756-L55M14
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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 type of applications is the 1756-L55M24 best suited for?
It is ideal for medium to large-scale automation systems requiring fast processing and high I/O capacity.
How does the controller support system expansion?
Through its modular architecture, allowing additional I/O and communication modules to be added easily.
Can multiple controllers operate in one chassis?
Yes, enabling distributed control within a single system.
What communication options are available?
It supports Ethernet, DeviceNet, ControlNet, DH+, SynchLink, and Remote I/O via optional modules.

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