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- Yokogawa
- SEC402
- Bus Coupler Module
- Japan
- 130 x 129.5 x 32.8 mm
- 0.24 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Yokogawa SEC402 Bus Coupler Module is an industrial communication interface designed for Yokogawa Distributed Control Systems (DCS) and ProSafe-RS safety instrumented systems. It functions as an ESB (Extended Safety Bus) coupler, enabling high-speed and deterministic communication between central control units and distributed I/O or safety nodes.
The SEC402 is widely used in high-availability automation environments, where stable real-time communication and system reliability are essential, such as oil & gas, petrochemical, offshore, and power generation industries.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | SEC402 |
| Product Type | Bus Coupler Module |
| Function | ESB Bus Communication Interface |
| System Compatibility | Yokogawa CENTUM / ProSafe-RS / DCS & SIS systems |
| Bus Type | ESB (Extended Safety Bus) |
| Installation | Control cabinet / system rack mounted |
| Dimensions | 130 × 129.5 × 32.8 mm |
| Weight | 0.24 kg |
| Communication Speed | Up to 128 Mbps (system dependent) |
| Max Connectable Nodes | Up to 9 units (system dependent) |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -20°C to +70°C |
| Country of Manufacture | Japan |
Function and Working Principle
The SEC402 operates as an ESB bus master or communication interface node, responsible for managing data exchange between control systems and distributed modules.
Its main functions include:
- Establishing ESB communication links between control stations and I/O nodes
- Synchronizing real-time process data across distributed systems
- Managing cyclic high-speed data transmission
- Ensuring deterministic communication performance
- Supporting scalable expansion of DCS and SIS architectures
The module coordinates communication cycles on the ESB network, ensuring all connected devices exchange data in a synchronized and reliable manner.
Role in Industrial Control Systems
Within Yokogawa architectures, the SEC402 acts as a core communication backbone module, connecting:
- Safety Control Stations (SCS)
- Field Control Units (FCU)
- Remote I/O nodes
- ProSafe-RS safety systems
- ESB network segments
It ensures seamless integration between distributed control and safety systems, maintaining overall system stability and availability.
Industrial Applications
The Yokogawa SEC402 Bus Coupler Module is widely used in:
- Distributed Control Systems (DCS)
- Safety Instrumented Systems (SIS)
- Emergency Shutdown Systems (ESD)
- Oil and gas production facilities
- Petrochemical and refining plants
- Offshore platforms
- Power generation stations
- Large-scale process automation systems
It is particularly important in environments requiring high-speed, fault-tolerant communication between distributed control nodes.
Installation and System Integration
Proper installation is essential for stable ESB communication performance.
Recommended practices include:
- Install in designated system rack slots
- Ensure correct ESB cable routing and termination
- Maintain proper grounding and shielding
- Avoid mechanical stress on connectors and cables
- Verify node configuration during commissioning
- Follow Yokogawa engineering and system integration standards
Correct installation ensures reliable and synchronized system communication.
Compatible System Components
The SEC402 is commonly used with:
- Yokogawa ProSafe-RS safety controllers
- ESB bus I/O node modules
- Field Control Units (FCU)
- CPU/processor modules (SCP series)
- Terminal boards (SEA / SBD series)
- System power supply modules
- Engineering and monitoring stations
These components together form a scalable and highly reliable industrial automation system.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| SEC402 | Bus Coupler Module | ESB communication interface | DCS & SIS systems |
| SEC401-50 | Bus Coupler Module | Enhanced variant | High-performance systems |
| SEC401-11 S3 | Bus Coupler Module | Standard revision model | General control systems |
| SEC401-11 S2 | Bus Coupler Module | Legacy version | Older systems |
| SB401 series | Interface Module | ESB communication support | Distributed control |
Key Advantages
- High-speed ESB communication up to 128 Mbps
- Deterministic and synchronized data transmission
- Strong compatibility with Yokogawa DCS and SIS systems
- Supports scalable distributed architectures
- Compact and lightweight industrial design
- Reliable operation in harsh industrial environments
- Suitable for continuous 24/7 operation
- Designed for safety-critical automation systems
- High system integration flexibility
Technical FAQs
What is the main function of SEC402?
It is a bus coupler module that enables ESB communication between control units and distributed I/O or safety nodes.
Is SEC402 a processor module?
No. It is a communication interface module, not a CPU.
Where is it used?
It is used in Yokogawa ProSafe-RS and DCS systems for ESB-based communication.
What is the difference between SEC401 and SEC402?
SEC402 is typically a different generation or configuration within the same ESB coupler family, offering system-dependent improvements in compatibility or architecture.
Conclusion
The Yokogawa SEC402 Bus Coupler Module is a critical communication component in Yokogawa Distributed Control and Safety Systems. It ensures fast, deterministic, and reliable ESB data exchange between distributed nodes, enabling stable and synchronized industrial automation performance. With its robust design and strong integration capability, it plays an essential role in modern process control and safety system architectures.