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- Yokogawa
- SNB10D-223
- 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-223 Safety Node Unit is a high-integrity distributed I/O node used in Yokogawa ProSafe-RS Safety Instrumented Systems (SIS). It functions as a field interface and communication hub, connecting field instruments to the central Safety Control Unit (SCU) via the ESB bus system.
This model is designed for mission-critical safety applications, including emergency shutdown and process protection systems, where redundancy and deterministic communication are essential.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | SNB10D-223 |
| Product Type | Safety Node Unit |
| System Compatibility | ProSafe-RS / SIS |
| Function | Safety I/O node + ESB communication + power distribution |
| Communication Protocol | ESB Bus / ER Bus (system dependent) |
| 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) |
| Redundancy | Dual-redundant power and communication support |
| I/O Capacity | Up to ~8 safety I/O modules (system dependent) |
| Operating Temperature | 0°C to +55°C (typical SIS enclosure spec) |
| Country of Manufacture | Japan |
Function and Working Principle
The SNB10D-223 operates as a distributed safety node, responsible for collecting field signals and transmitting them securely to the central safety controller.
Its core functions include:
- Acquisition of analog and digital field signals
- Communication with Safety Control Unit via ESB bus
- Power supply distribution to installed I/O modules
- Supporting redundant and fault-tolerant architecture
- Ensuring SIL-rated deterministic safety communication
System Data Flow
Field Devices → SNB10D-223 Node → ESB Bus → Safety Control Unit (SCU)
This structure ensures that even in the event of partial system failure, safety logic execution remains stable and uninterrupted.
Role in Industrial Control Systems
Within Yokogawa ProSafe-RS systems, the SNB10D-223 acts as a remote safety I/O hub, connecting:
- Safety transmitters (pressure, temperature, flow, level)
- Emergency shutdown switches and field contacts
- Safety digital and analog I/O modules
- Safety Control Stations (SCS)
- ESB / optical ESB network infrastructure
It allows distributed installation of I/O close to field equipment while maintaining centralized safety logic control.
Industrial Applications
The SNB10D-223 is widely used in:
- Safety Instrumented Systems (SIS)
- Emergency Shutdown Systems (ESD)
- Fire & Gas (F&G) detection systems
- Oil and gas upstream/downstream facilities
- Petrochemical and refinery plants
- Offshore platforms
- Power generation stations
- Chemical processing industries
It is especially critical where process safety integrity and system redundancy are required.
Installation and System Integration
Proper installation is essential for safe and reliable operation:
- Install in standard 19-inch industrial racks
- Ensure correct ESB bus routing and termination
- Maintain grounding and shielding integrity
- Configure redundancy according to system design
- Avoid mechanical stress on connectors
- Perform full system validation during commissioning
Compatible System Components
The SNB10D-223 works with:
- Yokogawa ProSafe-RS safety controllers
- ESB / optical ESB bus coupler modules (SEC401 / SEC402 series)
- Safety analog and digital I/O modules
- Terminal boards (SED / SEA / SBD series)
- Power supply modules
- Field instrumentation devices
- Engineering and maintenance stations
These components form a complete SIL-rated distributed safety architecture.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| SNB10D-223 | Safety Node Unit | Standard SIS node platform | General safety systems |
| SNB10D-215 | Safety Node Unit | Variant revision | System-specific deployment |
| SNB10D-213 | Safety Node Unit | Same family variant | Safety systems |
| SNB10D | Safety Node Unit | Base platform | General SIS applications |
| SNB10D-4 | Safety Node Unit | Updated generation | Modern safety systems |
Key Advantages
- SIL3-oriented safety system architecture
- High-reliability ESB communication backbone
- Supports redundant power and communication paths
- Modular and scalable I/O expansion
- Integrated power distribution for field modules
- Strong fault detection and diagnostics
- Designed for continuous 24/7 operation
- Reduces field wiring complexity
- Proven reliability in hazardous environments
Technical FAQs
What is SNB10D-223 used for?
It is a safety node unit used in Yokogawa ProSafe-RS systems for connecting field devices and managing ESB-based communication.
Is it a CPU or controller?
No. It is a distributed I/O node, not a processor or logic controller.
What makes it “safety grade”?
It is designed for SIL-rated systems with redundancy, diagnostics, and fault-tolerant communication architecture.
What is the role of ESB bus?
The ESB bus provides high-speed deterministic communication between safety nodes and the central control system.
Conclusion
The Yokogawa SNB10D-223 Safety Node Unit is a core component in industrial safety systems, enabling reliable field signal acquisition, ESB communication, and distributed I/O management. With its redundant architecture and SIL-oriented design, it ensures stable, safe, and continuous operation in demanding industrial environments.