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- Yokogawa
- SNB10D-225/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-225/CU2N Safety Node Unit is a distributed I/O and communication node used in Yokogawa ProSafe-RS Safety Instrumented Systems (SIS). It provides field signal acquisition, ESB bus communication, and power distribution for safety-critical control architectures.
The /CU2N configuration refers to a connector unit designed for ESB bus integration without termination, optimized for flexible system expansion and reliable communication between safety nodes.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | SNB10D-225/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 × 221.5 × 205 mm |
| Weight | 5.9 kg |
| Power Supply Options | 100–120 V AC / 220–240 V AC / 24 V DC (variant dependent) |
| Redundancy | Dual-redundant power and communication support |
| Operating Temperature | -20°C to +70°C |
| Humidity | 5%–95% RH (non-condensing) |
| Country of Manufacture | Japan |
Function and Working Principle
The SNB10D-225/CU2N operates as a distributed safety node, performing three key roles:
- Collecting analog and digital field signals from instruments
- Providing power distribution to connected I/O modules
- Transmitting safety data via ESB bus to the Safety Control Unit
System Signal Flow
Field Devices → SNB10D Node → ESB Bus → Safety Control Unit (SCU)
This architecture ensures deterministic and SIL-oriented communication, essential for emergency shutdown and process safety systems.
Role in Industrial Control Systems
Within Yokogawa ProSafe-RS systems, the SNB10D-225/CU2N functions as a local 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 reduces field wiring complexity while maintaining high system reliability and scalability.
Industrial Applications
The SNB10D-225/CU2N is widely used in:
- Safety Instrumented Systems (SIS)
- Emergency Shutdown Systems (ESD)
- Fire & Gas detection systems
- Oil and gas upstream and downstream facilities
- Petrochemical and refining plants
- Offshore platforms
- Power generation stations
- Chemical processing industries
It is especially critical in environments requiring high safety integrity and redundant control architecture.
Installation and System Integration
Proper installation ensures stable operation:
- Install in standard 19-inch industrial racks
- Ensure correct ESB bus cabling and node addressing
- Maintain grounding and shielding integrity
- Configure redundancy according to system design
- Avoid mechanical stress on connectors
- Perform full commissioning and loop checks
Compatible System Components
The SNB10D-225/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
- Field instrumentation devices
- Engineering and maintenance stations
These components form a complete SIL-rated distributed safety system architecture.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| SNB10D-225/CU2N | Safety Node Unit | ESB connector configuration | SIS / ESD systems |
| SNB10D-225/CU2T | Safety Node Unit | ESB termination support | End-of-line bus stability |
| SNB10D-223/CU2N | Safety Node Unit | Lower configuration variant | Standard safety systems |
| SNB10D-215/CU2N | Safety Node Unit | Mid-level revision | System expansion |
| SNB10D-213/CU2N | Safety Node Unit | Earlier platform version | Legacy SIS systems |
Key Advantages
- SIL3-oriented safety architecture design
- High-reliability ESB communication system
- Flexible connector configuration for system design
- Supports redundant power and communication paths
- Integrated power distribution for I/O modules
- Scalable distributed safety architecture
- Strong diagnostics and fault detection capability
- Designed for continuous 24/7 industrial operation
- Proven reliability in hazardous environments
Technical FAQs
What is SNB10D-225/CU2N used for?
It is used as a safety node unit in Yokogawa ProSafe-RS systems for field signal acquisition and ESB communication.
Is it a CPU or controller?
No. It is a distributed I/O and communication node, not a processing controller.
What does “/CU2N” mean?
It refers to a connector unit configuration used for ESB bus integration without termination.
What is the difference between CU2N and CU2T?
CU2T includes termination support for ESB bus end-of-line stability, while CU2N is used for standard inter-node connections.
Conclusion
The Yokogawa SNB10D-225/CU2N Safety Node Unit is a key component in industrial safety systems, providing reliable field signal acquisition, ESB communication, and power distribution within ProSafe-RS architectures. Its redundant design and SIL-oriented performance make it suitable for demanding process industries where safety, stability, and continuous operation are critical.