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- 1756-L55M12
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- 14.5 × 11.2 × 5.6 cm
- 0.36kg
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1756-L55M12 Detailed Product Overview
Product Introduction
The 1756-L55M12 is a programmable automation controller (PAC) from the ControlLogix platform, designed for industrial control systems that require reliable logic execution, modular expansion, and deterministic real-time performance. It is part of an early-generation ControlLogix CPU family and is typically used in medium-complexity automation architectures.
This controller functions as the central processing unit within a ControlLogix chassis, coordinating I/O modules, communication modules, and executing automation programs such as ladder logic and structured control routines. It is widely applied in manufacturing systems, process control environments, and material handling automation.
The 1756-L55M12 is especially suitable for legacy industrial installations where system continuity, maintenance replacement, and stable operation are required over long service lifecycles.
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 | Industrial Control and Program Execution |
| Application Field | Industrial Automation Systems |
| System Role | Central Processing Unit (CPU) |
Product Series Overview
ControlLogix Series
The 1756-L55M12 belongs to the ControlLogix modular automation system, which is designed for scalable industrial control applications requiring distributed architecture and flexible expansion.
This platform is widely used in both discrete manufacturing and process industries where reliable system coordination and real-time control are essential.
Key system capabilities include:
- PLC logic execution (ladder, structured text, function block)
- Modular I/O system integration
- Industrial network communication support
- Deterministic scan cycle processing
- Distributed control system architecture
- Basic motion and process control support
- System diagnostics and monitoring
- Long-term industrial reliability
The ControlLogix platform is widely deployed in large industrial facilities requiring continuous operation.
Product Features
1. Central Processing Function
Acts as the main CPU responsible for executing all automation logic and system control tasks.
2. Modular Expansion Architecture
Supports integration with multiple I/O and communication modules within the chassis.
3. Deterministic Execution
Ensures predictable and stable scan cycles for industrial control systems.
4. Backplane Communication
Communicates with all modules through high-speed internal backplane architecture.
5. Diagnostic Monitoring
Provides basic system fault detection and controller status monitoring.
6. Legacy System Compatibility
Designed for older ControlLogix installations requiring long-term support and replacement parts.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1756-L55M12 |
| Product Type | ControlLogix Processor Module |
| Series | ControlLogix |
| Processor Type | PLC / PAC CPU |
| User Memory | System-dependent legacy configuration |
| Backplane Current (5.1V DC) | ~1.23 A |
| Backplane Current (24V DC) | ~0.014 A |
| Power Dissipation | ~5.6 W |
| Thermal Dissipation | ~19 BTU/hr |
| 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 | Controller fault indicators |
| Battery | 1756-BA1 lithium battery |
| 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 |
| System Role | Central controller (CPU) |
| Dimensions | 14.5 × 11.2 × 5.6 cm |
| Weight kg（ ） | 0.36 kg |
Product Applications
Machine Automation Systems
Used for controlling machine sequences, interlocks, and production logic execution.
Manufacturing Production Lines
Applied in automated assembly lines and industrial manufacturing systems.
Material Handling Systems
Used in conveyor control, sorting systems, and logistics automation.
Process Control Systems
Supports control logic for industrial process operations and monitoring.
Packaging Equipment
Used in packaging machines and automated production equipment.
Legacy Industrial Systems
Widely used in maintenance and replacement of installed ControlLogix systems.
Product Advantages
Stable Control Performance
Ensures consistent execution of automation logic in industrial environments.
Modular System Integration
Fully compatible with ControlLogix I/O and communication modules.
Industrial Reliability
Designed for continuous 24/7 operation in demanding environments.
Deterministic Control Behavior
Provides predictable scan cycles for stable automation performance.
Long Lifecycle Support
Suitable for legacy systems requiring long-term maintenance.
Simple System Structure
Easier maintenance compared to modern multi-core architectures.
Recommended Related Models (Same Series)
| Model | Product Type | Key Feature | System Role | Dimensions | Weight kg（ ） |
|---|---|---|---|---|---|
| 1756-L55 | PLC Controller | Standard ControlLogix CPU | Main controller | 14.5 × 11.2 × 5.6 cm | 0.35 kg |
| 1756-L1M2 | PLC Controller | Early generation CPU | Legacy controller | 14.5 × 11.2 × 5.6 cm | 0.35 kg |
| 1756-L61 | PLC Controller | Improved 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-speed processing CPU | Advanced controller | 14.5 × 11.2 × 5.6 cm | 0.60 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 speed control | EtherNet/IP | 35.0 × 21.6 × 18.0 cm | 4.90 kg |
Installation Notes
Install in a grounded ControlLogix chassis with stable environmental conditions.
Ensure compatible firmware and module versions for system stability.
Avoid vibration and maintain proper cabinet temperature control.
Summary
The 1756-L55M12 is a legacy ControlLogix PLC controller designed for industrial automation systems requiring stable logic execution, modular expansion, and reliable long-term operation.
It is widely used in manufacturing, machine control, and process automation environments where system continuity and deterministic performance are essential.