1756-L55M24 | Allen-Bradley ControlLogix Processor Module

Description

The Allen-Bradley 1756-L55M24 is a high-performance processor module from the ControlLogix series, designed to handle large-scale automation and process control applications. Featuring both volatile and nonvolatile memory of 3.5 MB each, it provides fast program execution and efficient data handling for complex systems. The module supports up to 128,000 digital I/O points and 6,000 analog I/O points, offering exceptional flexibility for distributed control systems.

Engineered for industrial reliability, the 1756-L55M24 delivers fast scan performance, robust communication capabilities, and stable operation under vibration and high humidity conditions. It also includes support for battery backup (using 1756-BA1 or 1756-BATM), ensuring data retention and reliable system recovery.

Technical Specifications

• Manufacturer: Allen-Bradley

• Product Line: ControlLogix

• Model Number: 1756-L55M24

• Product Type: Processor Module

• Category: PLCs

• Weight: 0.75 lbs (0.34 kg)

• User Memory (RAM): 3.5 MB

• Nonvolatile Memory: 3.5 MB

• Maximum Digital I/O: 128,000 points

• Maximum Analog I/O: 4,000 inputs and 2,000 outputs

• Program Scan Time: 0.08 milliseconds

• Backplane Current (5V DC): 1.23 A

• Backplane Current (24V DC): 14 mA

• Vibration Resistance: 10–500 Hz

• Relative Humidity: 5–95% non-condensing

• Battery Type: 1756-BA1 or 1756-BATM

• Mounting Type: Standard ControlLogix chassis

• Operating Environment: Designed for industrial automation and continuous process systems

Application Scenarios

The 1756-L55M24 processor is widely used in demanding automation and process control environments where precision, reliability, and scalability are critical. Typical use cases include:

• Continuous process manufacturing (chemical, petrochemical, food & beverage)

• Discrete control systems in packaging and material handling

• High-performance motion and drive integration

• Power generation and energy management systems

Comparison with Similar Models

• 1756-L55M12: 1.5 MB memory version for mid-range applications

• 1756-L55M24: 3.5 MB version for larger, more complex systems

• 1756-L63: Successor model with increased processing speed and memory capacity

FAQs

Q1: Can the 1756-L55M24 support Ethernet-based communications?
A1: Yes, when paired with appropriate communication modules such as the 1756-ENBT or 1756-EN2T.

Q2: Does the module retain data after power loss?
A2: Yes, with the use of a compatible battery module (1756-BA1 or 1756-BATM) for backup.

Q3: What chassis types are compatible with this module?
A3: It can be installed in any standard Allen-Bradley ControlLogix chassis.