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- Yokogawa
- SNB10D-425
- Safety Node Unit
- Japan
- 482.6 x 221.5 x 205 mm
- 5.9 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Yokogawa SNB10D-425/CU2N Safety Node Unit is a distributed I/O node used in ProSafe-RS Safety Instrumented Systems (SIS). It provides field signal acquisition, ESB bus communication, and power distribution for safety-related modules.
The CU2N configuration indicates a standard ESB connector unit used for inter-node communication in distributed safety architectures, ensuring stable and reliable system integration.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | SNB10D-425/CU2N |
| Product Type | Safety Node Unit |
| System Platform | ProSafe-RS SIS |
| Function | Safety I/O node, ESB communication, power distribution |
| Communication Protocol | ESB Bus |
| Mounting Type | 19-inch rack mounted |
| Dimensions | 482.6 x 221.5 x 205 mm |
| Weight | 5.9 kg |
| Redundancy Support | Supported |
| Application | Industrial safety systems |
Function and Working Principle
The unit operates as a distributed safety interface node, performing:
- Collection of field analog and digital signals
- Transmission of safety data via ESB bus
- Power distribution to connected I/O modules
- Support for redundant safety architecture
System Flow
Field Devices → Safety Node Unit → ESB Bus → Safety Control Unit
Role in Safety Systems
In ProSafe-RS architecture, the SNB10D-425/CU2N serves as a local I/O expansion node, connecting:
- Field transmitters
- Safety switches
- Digital and analog I/O modules
- Central safety controllers
It helps reduce wiring complexity and supports modular system expansion.
Applications
- Oil and gas industry
- Petrochemical plants
- Refinery systems
- Offshore platforms
- Power plants
- Chemical processing
- Safety Instrumented Systems (SIS)
- Emergency Shutdown Systems (ESD)
- Fire & Gas systems
Installation
- 19-inch rack mounting
- ESB bus connection required
- Proper grounding and shielding required
- System-level configuration required for redundancy
Compatible Components
- Yokogawa ProSafe-RS controllers
- ESB bus coupler modules
- Safety I/O modules
- Terminal boards
- Power supply modules
Alternative Models
- SNB10D-425/CU2T (termination version)
- SNB10D-415/CU2N
- SNB10D-225/CU2N
- SNB10D-223/CU2N
- SNB10D-243/C2UN
Key Advantages
- High reliability safety architecture
- Supports redundant system design
- Stable ESB communication
- Modular expansion capability
- Suitable for continuous industrial operation
- Designed for safety-critical environments
FAQ
Q: Is this a CPU or controller?
A: No, it is a distributed safety node, not a controller.
Q: What is CU2N?
A: It is a connector configuration for ESB bus communication between nodes.
Q: Where is it used?
A: It is used in industrial safety systems such as SIS, ESD, and F&G systems.
Conclusion
The Yokogawa SNB10D-425/CU2N is a key safety node unit used in distributed control architectures. It ensures reliable communication, signal processing, and modular expansion in high-integrity industrial safety systems.