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- Yokogawa
- SNB10D-213/CU2N
- 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-213/CU2N Safety Node Unit is a variant of the SNB10D series used in ProSafe-RS Safety Instrumented Systems (SIS). It functions as a distributed safety node and ESB communication hub, connecting field I/O modules to the central safety controller while supporting stable power distribution and redundant communication.
The /CU2N configuration indicates a specific connector unit option with ESB termination support, ensuring reliable bus integrity in safety-critical installations.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | SNB10D-213/CU2N |
| Product Type | Safety Node Unit |
| System Compatibility | ProSafe-RS / SIS |
| Function | Safety I/O node + ESB communication + power distribution |
| Communication Protocol | ESB Bus |
| Installation | 19-inch rack mounted |
| Dimensions | 482.6 x 221.5 x 205 mm |
| Weight | 5.9 kg |
| Power Supply Options | 100–120 V AC / 220–240 V AC / 24 V DC |
| Redundancy | Dual-redundant ESB and power configuration support |
| Operating Temperature | -20°C to +70°C |
| Humidity | 5%–95% RH (non-condensing) |
| Country of Manufacture | Japan |
Function and Working Principle
The SNB10D-213/CU2N operates as a distributed safety I/O node, performing three core roles:
- Collecting digital and analog signals from field instruments
- Distributing power to connected I/O modules
- Transmitting safety-critical data via ESB bus to the control system
System Flow
Field Devices → SNB10D Node → ESB Bus → Safety Control Unit (SCU)
The system ensures deterministic, fault-tolerant, and SIL-oriented communication, which is essential for emergency shutdown and process safety functions.
Role in Industrial Control Systems
Within Yokogawa ProSafe-RS architectures, the SNB10D-213/CU2N acts as a local safety I/O and communication 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
This structure significantly reduces field wiring complexity while improving system scalability and maintainability.
Industrial Applications
The SNB10D-213/CU2N is widely used in:
- Safety Instrumented Systems (SIS)
- Emergency Shutdown Systems (ESD)
- Oil and gas upstream and downstream facilities
- Petrochemical and refining plants
- Offshore platforms
- Power generation stations
- Chemical processing industries
- Large-scale industrial automation systems
It is particularly important in environments where process safety and system redundancy are mandatory.
Installation and System Integration
Proper installation ensures stable and safe operation:
- Install in standard 19-inch industrial racks
- Ensure ESB bus cabling uses correct termination (/CU2N configuration)
- Maintain proper grounding and shielding practices
- Configure redundancy according to system design
- Avoid mechanical stress on connectors
- Perform full system verification during commissioning
Correct setup ensures stable communication and high system availability.
Compatible System Components
The SNB10D-213/CU2N 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 (SEA / SED / SBD series)
- Power supply modules for node operation
- Field instrumentation devices
- Engineering and maintenance stations
These components together form a complete SIL-capable distributed safety architecture.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| SNB10D-213/CU2N | Safety Node Unit | ESB termination connector option | SIS / ESD systems |
| SNB10D-213/CN2N | Safety Node Unit | Alternative connector configuration | Safety systems |
| SNB10D | Safety Node Unit | Base platform | General safety applications |
| SNB10D-4 | Safety Node Unit | Updated revision | Modern SIS architectures |
| SCS Safety Controller | Control Unit | Central safety processing | System-level control |
Key Advantages
- SIL3-oriented safety system architecture
- ESB communication with termination-optimized configuration (/CU2N)
- High reliability for mission-critical applications
- Supports redundant system design
- Integrated power distribution for I/O modules
- Scalable distributed safety architecture
- Strong diagnostics and fault detection capability
- Designed for continuous 24/7 operation
- Proven performance in hazardous environments
Technical FAQs
What is SNB10D-213/CU2N used for?
It is used as a safety node unit in Yokogawa ProSafe-RS systems to connect field devices and manage ESB-based communication and power distribution.
What does “/CU2N” mean?
It refers to a connector unit configuration with ESB termination support for improved bus stability.
Is it a controller or CPU?
No. It is a distributed safety node, not a processing CPU.
What is the difference between CN2N and CU2N?
Both are connector variants; CU2N typically includes termination-oriented configuration for ESB bus integrity.
Conclusion
The Yokogawa SNB10D-213/CU2N Safety Node Unit is a critical component in industrial safety systems. It provides reliable field signal acquisition, ESB communication with termination support, and integrated power distribution for I/O modules. With its redundant design and SIL-oriented architecture, it plays a vital role in ensuring safe, stable, and continuous operation in complex industrial environments.