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- Yokogawa
- SNB10D-243/C2UT
- 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-243/C2UT Safety Node Unit is a distributed I/O node used in Yokogawa ProSafe-RS Safety Instrumented Systems (SIS). It functions as a field interface module, enabling ESB bus communication, power distribution, and reliable data exchange between field instruments and the central Safety Control Unit (SCU).
The /C2UT configuration refers to a connector unit variant with ESB termination support, designed to improve signal integrity at the end of the ESB bus line in safety system architectures.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | SNB10D-243/C2UT |
| 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 (variant dependent) |
| 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-243/C2UT operates as a distributed safety node responsible for handling field signals and communication within a safety system.
Main functions include:
- Acquisition of analog and digital field signals
- ESB bus communication with Safety Control Unit
- Power distribution to connected I/O modules
- Support for redundant and fault-tolerant system operation
- ESB termination support for stable bus signal integrity
System Data Flow
Field Devices → SNB10D Node → ESB Bus → Safety Control Unit (SCU)
This structure ensures deterministic and SIL-oriented communication, which is essential for emergency shutdown and process safety applications.
Role in Industrial Control Systems
Within Yokogawa ProSafe-RS architectures, the SNB10D-243/C2UT acts 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 supports distributed I/O placement close to field equipment while maintaining centralized safety logic control.
Industrial Applications
The SNB10D-243/C2UT is widely used in:
- Safety Instrumented Systems (SIS)
- Emergency Shutdown Systems (ESD)
- Fire & Gas detection systems
- Oil and gas production and refining facilities
- Petrochemical plants
- Offshore platforms
- Power generation stations
- Chemical processing industries
It is especially important where high reliability, redundancy, and SIL compliance are required.
Installation and System Integration
Proper installation ensures stable operation:
- Install in standard 19-inch industrial racks
- Ensure correct ESB bus routing and termination (/C2UT configuration)
- Maintain grounding and shielding integrity
- Configure redundancy according to system architecture
- Avoid mechanical stress on connectors
- Perform full system commissioning and loop checks
Compatible System Components
The SNB10D-243/C2UT 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 architecture.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| SNB10D-243/C2UT | Safety Node Unit | ESB termination connector variant | SIS / ESD systems |
| SNB10D-243/C2UN | Safety Node Unit | Non-termination connector version | Standard node connections |
| SNB10D-225/CU2T | Safety Node Unit | Higher-level system variant | Advanced SIS systems |
| SNB10D-223/CU2N | Safety Node Unit | Standard configuration | General safety systems |
| SNB10D-215/CU2N | Safety Node Unit | Mid-level variant | Expansion systems |
Key Advantages
- SIL3-oriented safety system architecture
- High-reliability ESB communication backbone
- Terminator-optimized connector design for stable bus signaling
- Supports redundant power and communication paths
- Modular and scalable distributed I/O structure
- Strong diagnostics and fault detection capability
- Designed for continuous 24/7 operation
- Reduces field wiring complexity
- Proven performance in harsh industrial environments
Technical FAQs
What is SNB10D-243/C2UT 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 “/C2UT” mean?
It indicates a connector unit configuration with ESB termination support for improved bus stability at network endpoints.
What is the difference between C2UT and C2UN?
C2UT includes termination support for ESB bus end-of-line stability, while C2UN is used for standard inter-node connection.
Conclusion
The Yokogawa SNB10D-243/C2UT Safety Node Unit is a critical component in industrial safety systems. It ensures reliable field signal acquisition, ESB communication, and power distribution within ProSafe-RS architectures. With its redundant design and termination-optimized connector configuration, it provides stable and safe operation in demanding industrial environments where system integrity is essential.