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- Yokogawa
- SNB10D-215/CU2T
- 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-215/CU2T Safety Node Unit is a distributed safety I/O node used in Yokogawa ProSafe-RS Safety Instrumented Systems (SIS). It provides field signal acquisition, ESB bus communication, and integrated power distribution for connected I/O modules.
The /CU2T configuration indicates a connector unit with ESB bus termination, which helps maintain signal stability in safety-critical redundant network architectures.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | SNB10D-215/CU2T |
| 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 |
| Redundancy | Dual-redundant ESB and power architecture support |
| Operating Temperature | -20°C to +70°C |
| Humidity | 5%–95% RH (non-condensing) |
| Country of Manufacture | Japan |
Function and Working Principle
The SNB10D-215/CU2T operates as a distributed safety node, responsible for handling field signals and communicating with the central safety controller.
Its main functions include:
- Collecting analog and digital field signals
- Supplying power to I/O modules inside the node
- Transmitting safety data via ESB bus
- Maintaining communication integrity using termination support (/CU2T)
System Data Flow
Field Devices → SNB10D Node → ESB Bus → Safety Control Unit (SCU)
This architecture ensures deterministic, fault-tolerant, and SIL-oriented communication, which is essential in emergency shutdown and process safety systems.
Role in Industrial Control Systems
Within Yokogawa ProSafe-RS systems, this node functions as a localized 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 wiring complexity while improving modularity and long-term system maintainability.
Industrial Applications
The SNB10D-215/CU2T 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 especially important in environments requiring high availability and functional safety compliance.
Installation and System Integration
Correct installation ensures safe and stable operation:
- Install in standard 19-inch industrial racks
- Use proper ESB cable routing with termination (/CU2T configuration)
- Maintain grounding and shielding integrity
- Configure redundancy according to system architecture
- Avoid mechanical stress on connectors
- Complete commissioning checks for node communication
Compatible System Components
The SNB10D-215/CU2T 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 diagnostics stations
These components together form a complete SIL-rated distributed safety system architecture.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| SNB10D-215/CU2T | Safety Node Unit | ESB termination connector option | SIS / ESD systems |
| SNB10D-213/CU2T | Safety Node Unit | Same platform variant | Safety systems |
| SNB10D-213/CU2N | Safety Node Unit | Alternative connector type | Safety systems |
| SNB10D | Safety Node Unit | Base platform | General safety applications |
| SNB10D-4 | Safety Node Unit | Updated revision | Modern SIS architectures |
Key Advantages
- SIL3-oriented safety system design
- ESB communication with termination-optimized configuration
- High reliability for mission-critical applications
- Supports redundant power and communication architecture
- Integrated I/O power distribution
- Scalable distributed safety architecture
- Strong diagnostics and fault detection capability
- Designed for continuous 24/7 operation
- Proven performance in hazardous industrial environments
Technical FAQs
What is SNB10D-215/CU2T used for?
It is a safety node unit used in Yokogawa ProSafe-RS systems to connect field devices and manage ESB communication with integrated power distribution.
What does “/CU2T” mean?
It refers to a connector unit configuration with ESB termination support to improve bus stability.
Is it a CPU or controller?
No. It is a distributed safety I/O node, not a processing unit.
What is the difference between CU2T and CU2N?
CU2T includes termination support for ESB bus ends, improving signal integrity in network layouts.
Conclusion
The Yokogawa SNB10D-215/CU2T Safety Node Unit is a critical component in industrial safety automation systems. It provides reliable field signal acquisition, ESB communication with termination support, and integrated power distribution. With its redundant architecture and SIL-oriented design, it ensures stable and continuous operation in demanding process safety environments.