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- Yokogawa
- SNB10D
- 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 Safety Node Unit is a high-integrity industrial node used in Yokogawa ProSafe-RS Safety Instrumented Systems (SIS). It functions as a field I/O aggregation and safety communication node, connecting field devices such as sensors and actuators to the central safety control unit via an ESB bus architecture.
This unit is designed for mission-critical safety applications, ensuring reliable signal acquisition, secure data transmission, and stable power distribution for connected I/O modules.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | SNB10D |
| Product Type | Safety Node Unit |
| System Type | ProSafe-RS / SIS (Safety Instrumented System) |
| Function | Field I/O interface + safety signal transmission + power distribution |
| Communication | ESB Bus / Optical ESB Bus |
| Installation | 19-inch rack mounted |
| Dimensions | 482.6 × 221.5 × 205 mm |
| Weight | 5.9 kg |
| Power Supply | 100–120 V AC / 220–240 V AC / 24 V DC (variant dependent) |
| Power Consumption | Approx. 200–230 VA (AC models) |
| Safety Level | SIL3 capable system design |
| Redundancy | Dual-redundant configuration support |
| Operating Temperature | -20°C to +70°C (variant dependent) |
| Country of Manufacture | Japan |
Function and Working Principle
The SNB10D operates as a distributed safety I/O node, performing three key roles:
- Collecting analog and digital signals from field instruments
- Supplying power to connected I/O modules inside the node
- Transmitting process data securely to the safety controller via ESB bus
Working Logic Flow
Field Devices → SNB10D Node → ESB Bus Communication → Safety Control Unit
The system ensures deterministic and fail-safe communication, which is essential for emergency shutdown and process safety applications.
Role in Industrial Control Systems
Within Yokogawa ProSafe-RS architectures, the SNB10D acts as a local safety I/O hub, connecting:
- Safety transmitters (pressure, temperature, flow, level)
- Emergency shutdown switches and field contacts
- Safety analog and digital I/O modules
- Safety control stations (SCS)
- ESB/optical ESB network infrastructure
It significantly reduces wiring complexity while improving system reliability and maintainability.
Industrial Applications
The Yokogawa SNB10D is widely used in:
- Safety Instrumented Systems (SIS)
- Emergency Shutdown Systems (ESD)
- Oil and gas production platforms
- Refinery and petrochemical plants
- Offshore drilling systems
- Power generation facilities
- Chemical processing plants
- Large-scale industrial automation systems
It is specifically designed for environments where system failure could result in critical safety risks.
Installation and System Integration
Proper installation is essential for safe and reliable operation.
Recommended practices include:
- Install in 19-inch industrial control cabinets
- Ensure proper grounding and shielding for ESB communication
- Maintain correct slot mapping for I/O modules
- Use approved ESB cables and connectors
- Verify redundancy configuration during commissioning
- Follow Yokogawa ProSafe-RS engineering guidelines
Correct installation ensures stable safety communication and reduces system downtime risk.
Compatible System Components
The SNB10D works with:
- Yokogawa ProSafe-RS safety controllers
- ESB / Optical ESB bus coupler modules (SEC401 / SEC402 series)
- I/O modules (analog and digital safety modules)
- Power supply modules for node operation
- Terminal boards (SEA / SED / SBD series)
- Field instrumentation devices
- Engineering and maintenance stations
These components form a complete safety-certified distributed control architecture.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| SNB10D | Safety Node Unit | Standard safety node platform | SIS / ESD systems |
| SNB10D-2 | Safety Node Unit | Enhanced redundancy option | High-availability systems |
| SNB10D-4 | Safety Node Unit | Updated hardware revision | Modern ProSafe-RS systems |
| SCS Safety Controller | Control Unit | Central safety processing | System-level control |
| N-IO Node Unit | I/O Node | Non-safety distributed I/O | General DCS applications |
Key Advantages
- SIL3-capable safety system architecture
- High-reliability ESB communication interface
- Supports redundant system configuration
- Integrated power supply for I/O modules
- Scalable distributed safety architecture
- Strong fault tolerance and diagnostics
- Designed for continuous 24/7 operation
- Reduces field wiring complexity
- Proven reliability in hazardous environments
Technical FAQs
What is the main function of SNB10D?
It is a safety node unit that connects field devices to a Yokogawa safety control system and manages I/O communication via ESB bus.
Is SNB10D a controller or CPU?
No. It is a distributed I/O and communication node, not a processor module.
What system uses SNB10D?
It is used in Yokogawa ProSafe-RS Safety Instrumented Systems (SIS).
Why is redundancy important in SNB10D?
Redundancy ensures continuous operation even if part of the system fails, which is critical for safety applications.
Conclusion
The Yokogawa SNB10D Safety Node Unit is a critical component in safety instrumented control architectures. It provides reliable field signal acquisition, ESB-based communication, and integrated power distribution for I/O modules. With its SIL3-oriented design, redundant architecture support, and robust industrial construction, it plays a vital role in ensuring safe and continuous operation in high-risk industrial environments.