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- Allen Bradley
- 1756-L55
- ControlLogix ControlNet Communication Module
- USA
- 14.5 × 11.2 × 5.6 cm
- 0.35kg
- Xiamen, China
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1756-L55 Detailed Product Overview
Product Introduction
The 1756-L55 is a ControlLogix programmable automation controller (PAC) designed for industrial automation systems requiring reliable logic execution, system coordination, and modular expansion capability. It belongs to an early generation ControlLogix processor family and is widely used in medium-scale industrial control applications.
This controller acts as the central processing unit (CPU) in a ControlLogix chassis, managing I/O modules, communication modules, and executing ladder logic, structured text, and function block programs. It is commonly found in manufacturing systems, process control plants, material handling systems, and machine automation environments.
The 1756-L55 is designed for stable long-term industrial operation, especially in legacy installations that require maintenance or replacement of existing control systems.
Brand Information
| Item | Details |
|---|---|
| Brand | Allen Bradley |
| Product Category | PLC Controller Module |
| Product Type | ControlLogix Processor (CPU) |
| Platform | ControlLogix |
| Installation Method | Chassis Mounted |
| Main Function | Program Execution and System Control |
| Application Field | Industrial Automation Systems |
| System Role | Central Processing Unit (CPU) |
Product Series Overview
ControlLogix Series
The 1756-L55 belongs to the ControlLogix modular automation platform, designed for scalable and flexible industrial control systems.
This series supports distributed architecture and allows multiple controllers, I/O modules, and communication modules to work together in a single integrated system.
Key system capabilities include:
- PLC logic execution (ladder, function block, structured text)
- I/O system coordination
- Industrial network communication
- Motion control support (basic level depending on configuration)
- Modular chassis expansion
- Real-time deterministic control
- Diagnostics and system monitoring
- Legacy system compatibility
ControlLogix systems are widely used in industrial automation environments requiring stable and continuous operation.
Product Features
1. Centralized Processing Unit
The 1756-L55 serves as the main controller responsible for executing all automation logic.
2. Modular System Architecture
Supports integration with multiple I/O and communication modules within the ControlLogix chassis.
3. Deterministic Scan Execution
Provides predictable scan cycles for consistent industrial control performance.
4. Backplane Communication
Communicates with all modules through high-speed backplane architecture.
5. Industrial Diagnostics
Provides basic fault detection and system status monitoring for maintenance support.
6. Legacy System Support
Commonly used in existing installations requiring long-term continuity and spare part replacement.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1756-L55 |
| Product Type | ControlLogix Processor Module |
| Series | ControlLogix |
| Processor Type | PLC / PAC CPU |
| User Memory | No onboard user memory (config-dependent architecture) |
| Backplane Current (5.1V DC) | 1.23 – 1.25 A |
| Backplane Current (24V DC) | 0.014 A |
| Power Dissipation | 5.6 – 5.7 W |
| Thermal Dissipation | 19.1 – 19.4 BTU/hr |
| Isolation Voltage | 30 V continuous |
| Programming Software | RSLogix 5000 (legacy versions) |
| Communication | Backplane-based module communication |
| Supported Modules | ControlLogix I/O and communication modules |
| Redundancy Support | Not supported |
| Scan Mode | Cyclic deterministic scan |
| Diagnostics | Basic controller fault indicators |
| Mounting Type | Chassis mount |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5%–95% non-condensing |
| Noise Immunity | Industrial EMC protection |
| Battery | 1756-BA1 lithium battery |
| Dimensions | 14.5 × 11.2 × 5.6 cm |
| Weight kg（ ） | 0.35 kg |
Product Applications
Industrial Machine Control
Used to manage machine sequences, interlocks, and automated production logic.
Manufacturing Systems
Applied in assembly lines and automated production equipment.
Material Handling Systems
Used in conveyor control, sorting systems, and warehouse automation.
Process Control Systems
Provides logic execution for industrial process operations.
Packaging Equipment
Used in packaging machines and automated handling systems.
Legacy Industrial Installations
Commonly used for maintenance and replacement in existing ControlLogix systems.
Product Advantages
Stable Control Performance
Provides reliable execution of industrial automation logic.
Modular Integration
Seamlessly integrates with ControlLogix I/O and communication modules.
Industrial Reliability
Designed for continuous operation in demanding environments.
Deterministic Operation
Ensures predictable scan cycles for consistent control behavior.
Long-Term System Support
Suitable for legacy systems requiring long lifecycle maintenance.
Simple Architecture
Easier to maintain compared to newer multi-core controller systems.
Recommended Related Models (Same Series)
| Model | Product Type | Key Feature | System Role | Dimensions | Weight kg（ ） |
|---|---|---|---|---|---|
| 1756-L1M2 | PLC Controller | Early ControlLogix CPU | Main controller | 14.5 × 11.2 × 5.6 cm | 0.35 kg |
| 1756-L61 | PLC Controller | Enhanced processing capability | CPU | 14.5 × 11.2 × 5.6 cm | 0.50 kg |
| 1756-L63 | PLC Controller | Higher memory system | CPU | 14.5 × 11.2 × 5.6 cm | 0.55 kg |
| 1756-L71 | PLC Controller | High-performance processor | CPU | 14.5 × 11.2 × 5.6 cm | 0.60 kg |
| 1756-L81E | PLC Controller | Modern Ethernet-enabled CPU | Advanced controller | 15.2 × 14.0 × 5.5 cm | 0.62 kg |
Popular Models from Same Brand
| Model | Product Type | Function | Communication | Dimensions | Weight kg（ ） |
|---|---|---|---|---|---|
| 1756-EN2TR | Ethernet Module | Industrial networking | EtherNet/IP | 14.5 × 11.2 × 5.6 cm | 0.50 kg |
| 1756-IF8 | Analog Input Module | Signal acquisition | Backplane | 14.5 × 11.2 × 5.6 cm | 0.42 kg |
| 1756-IV32 | Digital Input Module | High-density inputs | Backplane | 30.0 × 3.8 × 11.1 cm | 1.00 kg |
| 2711P-T10C4D8 | HMI Panel | Operator interface | Ethernet/USB | 27.1 × 21.1 × 6.0 cm | 1.80 kg |
| 25B-D017N104 | VFD Drive | Motor control | EtherNet/IP | 35.0 × 21.6 × 18.0 cm | 4.90 kg |
Installation Notes
Install the controller in a properly grounded ControlLogix chassis with stable ventilation.
Ensure compatible firmware and module versions for stable system operation.
Avoid excessive vibration and maintain proper cabinet temperature control.
Summary
The 1756-L55 is an early-generation ControlLogix PLC controller designed for industrial automation systems requiring stable logic execution and modular system integration.
It remains widely used in legacy installations due to its reliability, deterministic performance, and compatibility with existing ControlLogix architectures.
It is suitable for manufacturing, machine control, and process automation systems where long-term stable operation is essential.