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- Yokogawa
- SEC402-21
- 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 SEC402-21 Bus Coupler Module is an industrial ESB communication interface used in Yokogawa Distributed Control Systems (DCS) and ProSafe-RS safety systems. It is designed to act as an ESB (Extended Safety Bus) master interface, enabling high-speed, deterministic communication between control stations and distributed I/O or safety nodes.
This model is commonly used in safety-critical automation architectures, such as oil & gas, petrochemical, offshore, and power generation systems, where reliable real-time communication is essential.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | SEC402-21 |
| Product Type | Bus Coupler Module |
| Function | ESB Bus Communication Interface (Master Node) |
| System Compatibility | Yokogawa ProSafe-RS / CENTUM (system dependent) |
| 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 (per port, system dependent) |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -40°C to +85°C |
| Country of Manufacture | Japan |
Function and Working Principle
The SEC402-21 operates as an ESB bus master communication module, responsible for managing synchronized data exchange across distributed control and safety nodes.
Its core functions include:
- Establishing ESB communication between control units and I/O nodes
- Transferring real-time process data at high speed
- Synchronizing distributed modules across the control network
- Ensuring deterministic and fault-tolerant communication cycles
- Supporting redundant safety communication architectures (system dependent)
The module continuously manages cyclic data transmission, ensuring that all connected nodes operate in a coordinated and predictable manner.
Role in Industrial Control Systems
Within Yokogawa systems, the SEC402-21 acts as a communication backbone module, connecting:
- Safety Control Stations (SCS)
- Field Control Units (FCU)
- Remote I/O nodes
- ProSafe-RS safety systems
- ESB bus network segments
This enables unified operation between distributed control and safety systems, improving overall system reliability and availability.
Industrial Applications
The Yokogawa SEC402-21 is widely used in:
- Safety Instrumented Systems (SIS)
- Emergency Shutdown Systems (ESD)
- Distributed Control Systems (DCS)
- Oil and gas production facilities
- Petrochemical and refining plants
- Offshore platforms
- Power generation stations
- Large-scale process automation systems
It is especially critical in environments requiring fast, deterministic, and fault-tolerant communication between control nodes.
Installation and System Integration
Proper installation is essential for stable ESB communication.
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 setup ensures stable and synchronized communication performance.
Compatible System Components
The SEC402-21 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 form a scalable and high-reliability industrial automation architecture.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| SEC402-21 | Bus Coupler Module | ESB communication interface | DCS & SIS systems |
| SEC402 | Bus Coupler Module | Base variant | Standard systems |
| SEC401-50 | Bus Coupler Module | Enhanced ESB coupler | High-performance systems |
| SEC401-11 S3 | Bus Coupler Module | Updated revision | General control systems |
| SB401 series | Interface Module | ESB communication support | Distributed control |
Key Advantages
- High-speed ESB communication up to 128 Mbps
- Deterministic real-time data transmission
- Strong compatibility with Yokogawa DCS and SIS systems
- Supports scalable distributed architectures
- Compact and lightweight industrial design
- Reliable performance in harsh environments
- Suitable for continuous 24/7 operation
- Designed for safety-critical automation systems
- Strong system integration capability
Technical FAQs
What is the main function of SEC402-21?
It is an ESB bus coupler module that enables high-speed communication between control stations and distributed I/O or safety nodes.
Is SEC402-21 a CPU module?
No. It is a communication interface module, not a processor.
Where is it used?
It is used in Yokogawa ProSafe-RS and CENTUM systems for ESB-based communication.
What does “21” indicate?
It typically represents a specific configuration or revision variant within the SEC402 family, depending on system design.
Conclusion
The Yokogawa SEC402-21 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 proven reliability, it plays an essential role in modern process control and safety system architectures.