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- 1747-L551
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- 25 × 16.5 × 5.6 cm
- 0.42kg
- Xiamen, China
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Allen Bradley 1747-L551 Detailed Product Introduction and Technical Specifications
Product Overview
The Allen Bradley 1747-L551 is a SLC 5/05 series programmable logic controller CPU module used in the SLC 500 industrial automation platform. It is a high-performance processor designed for industrial environments requiring fast execution speed, reliable communication, and stable long-term operation.
This controller is widely applied in medium and large automation systems, including manufacturing lines, process control systems, packaging machinery, and distributed industrial networks.
The key upgrade of the SLC 5/05 family is the built-in Ethernet communication capability, which significantly improves integration with modern supervisory systems compared to earlier SLC models.
The 1747-L551 is also commonly used in legacy systems that still require Ethernet connectivity and stable PLC processing.
Brand Information
| Item | Details |
|---|---|
| Brand | Allen Bradley |
| Product Model | 1747-L551 |
| Product Type | PLC CPU Module |
| Product Family | SLC 500 Series |
| Series | SLC 5/05 Controller Series |
| Main Function | Central Processing Unit for Industrial Automation |
| Communication | Ethernet, DH-485, RS-232 |
| Installation Type | Rack-mounted CPU Module |
Product Series Introduction
SLC 500 Series Overview
The SLC 500 series is a modular PLC system designed for industrial automation control applications.
It provides a flexible architecture including CPU modules, I/O modules, communication modules, and power supplies installed in rack-based systems.
The system is widely used in manufacturing, process control, logistics, and packaging industries due to its stability and long operational lifecycle.
The 1747-L551 belongs to the SLC 5/05 CPU family, which is the Ethernet-enabled version of the SLC 500 platform.
Detailed Technical Specifications of 1747-L551
| Parameter | Specification |
|---|---|
| Model | 1747-L551 |
| Processor Type | SLC 5/05 CPU |
| User Memory | 16K words |
| Program Memory | 16 KB battery-backed RAM |
| Instruction Execution Speed | ~0.9 ms / K instruction |
| I/O Scan Time | ~0.225 ms |
| Maximum I/O Capacity | 4096 inputs / 4096 outputs |
| Analog I/O Support | Up to 480 channels |
| Maximum I/O Chassis | 3 chassis |
| Maximum Module Slots | 30 slots |
| Communication Ports | Ethernet, RS-232 |
| Communication Protocols | Ethernet/IP, DF1, DH-485, ASCII |
| Backplane Current (5V DC) | 1.0 A |
| Backplane Current (24V DC) | ~175 mA |
| Memory Type | Battery-backed RAM |
| Backup Memory | Flash EPROM support (1747-M13) |
| Battery Type | 1747-BA |
| Power Supply Compatibility | 1746-P1 to 1746-P7 |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5%–95% non-condensing |
| Shock Resistance | 30G operating |
| Vibration Resistance | Industrial standard |
| Dimensions | 25 × 16.5 × 5.6 cm |
| Weight (kg) | 0.42 kg |
Product Features
1. Built-in Ethernet Communication
The most important feature of the 1747-L551 is its integrated Ethernet port.
It supports high-speed communication for SCADA systems, programming access, and industrial networking.
2. Stable PLC Processing Performance
The CPU delivers consistent scan cycles with approximately 0.9 ms per K instruction execution speed.
This ensures deterministic control behavior in real-time industrial systems.
3. Multi-Protocol Communication Support
The controller supports Ethernet/IP, DF1, DH-485, and ASCII protocols.
This allows flexible integration with both modern and legacy industrial systems.
4. High I/O Expansion Capability
Supports up to 4096 digital inputs and outputs and up to 480 analog channels.
This makes it suitable for medium and large industrial automation systems.
5. Advanced Memory Architecture
The system uses battery-backed RAM with flash backup support.
This ensures program retention during power loss and fast system recovery.
6. Flexible System Integration
The controller integrates seamlessly with SLC 500 racks and modules.
It supports multi-chassis expansion for larger automation systems.
Product Applications
Manufacturing Automation
Used in production lines requiring coordinated machine control and sequencing.
Process Control Systems
Applied in chemical, oil & gas, water treatment, and industrial monitoring systems.
Packaging Systems
Controls high-speed packaging, labeling, and filling machines.
Material Handling Systems
Used in conveyor networks, warehouse logistics, and sorting systems.
Networked Industrial Systems
Supports Ethernet-based distributed control and monitoring architectures.
Product Advantages
| Advantage | Description |
|---|---|
| Built-in Ethernet Port | Enables modern network integration |
| Stable Processing Speed | Reliable scan cycle performance |
| Large I/O Capacity | Suitable for complex systems |
| Multi-Protocol Support | Flexible communication options |
| Battery Backup Memory | Prevents data loss |
| Industrial Durability | Long operational lifespan |
| Legacy Compatibility | Works with older SLC systems |
| Easy Maintenance | Modular rack-based structure |
Recommended Models from the Same Series or Related Series
| Model | Product Type | Main Function | Application | Dimensions | Weight (kg) |
|---|---|---|---|---|---|
| 1747-L532 | CPU Module | SLC 5/03 controller | Industrial automation | 25 × 16.6 × 5.9 cm | 0.34 kg |
| 1747-L541 | CPU Module | SLC 5/04 controller | Large systems | 25 × 17 × 6 cm | 0.45 kg |
| 1747-L542 | CPU Module | High-performance CPU | Distributed systems | 25 × 16.6 × 5.9 cm | 0.40 kg |
| 1747-L543 | CPU Module | High-end SLC 5/04 | Complex automation | 25 × 16.5 × 6 cm | 0.45 kg |
| 1747-L551 | CPU Module | Ethernet-enabled CPU | Networked control systems | 25 × 16.5 × 5.6 cm | 0.42 kg |
Recommended Popular Models from Same Brand
| Model | Product Category | Main Features | Application Area | Dimensions | Weight (kg) |
|---|---|---|---|---|---|
| 1756-EN2TR | Ethernet Module | Dual Ethernet/IP ports | Industrial networking | 14 × 11 × 8 cm | 0.45 kg |
| 1769-L33ER | Compact PLC | Built-in Ethernet/IP | Machine automation | 18 × 12 × 9 cm | 0.92 kg |
| 1756-IB16 | Digital Input Module | 16-channel input | Factory systems | 15 × 11 × 6 cm | 0.30 kg |
| 1769-IF8 | Analog Input Module | 8-channel analog input | Process control | 12 × 9 × 5 cm | 0.35 kg |
| 1783-US8T | Industrial Switch | Managed Ethernet switch | Network systems | 16 × 12 × 5 cm | 0.80 kg |
System Role in Industrial Automation
The 1747-L551 acts as the central processing unit in SLC 500 PLC systems.
It executes control logic, manages I/O modules, and provides Ethernet-based communication for industrial networks.
Its built-in Ethernet capability makes it one of the most network-friendly controllers in the SLC 500 family.
Installation and Maintenance Characteristics
The CPU is installed in a standard SLC 500 rack system with power supply and I/O modules.
LED indicators display run status, fault conditions, and communication activity.
Maintenance is simplified due to modular hardware design and stable architecture.
Battery replacement ensures long-term program retention capability.
Industrial Reliability
The 1747-L551 is widely used in industrial environments due to its stable performance and Ethernet-enabled architecture.
It remains one of the most important SLC 5/05 processors in legacy and hybrid automation systems.
Its durability and network capability make it suitable for long-term industrial operation.
Summary
The Allen Bradley 1747-L551 is a high-performance SLC 5/05 PLC CPU designed for industrial automation systems requiring Ethernet communication.
It offers stable processing, 16K memory capacity, and strong multi-protocol networking capability.
Its reliability, connectivity, and compatibility make it a widely used controller in both modernized and legacy industrial environments.