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- Yokogawa
- SNB10D-243/C2UN
- Safety Node Unit
- Japan
- 482.6 x 221.5 x 205 mm 5.9 kg
- 5.9 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Yokogawa SNB10D-243/C2UN Safety Node Unit is part of the Yokogawa ProSafe-RS Safety Instrumented System (SIS) architecture. It functions as a distributed safety I/O node, responsible for field signal collection, ESB bus communication, and power distribution to connected I/O modules.
The /C2UN configuration indicates a connector unit variant used for ESB bus integration, supporting stable communication between safety nodes in redundant industrial control systems.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | SNB10D-243/C2UN |
| 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/C2UN operates as a distributed safety node, performing core functions within the SIS architecture:
- Acquisition of analog and digital field signals
- ESB bus communication with Safety Control Unit (SCU)
- Power distribution to connected I/O modules
- Support for redundant and fault-tolerant system operation
- Ensuring deterministic safety communication for critical processes
System Signal Flow
Field Devices → SNB10D Node → ESB Bus → Safety Control Unit (SCU)
This structure ensures continuous safe operation even under fault conditions, which is essential for SIL-rated applications.
Role in Industrial Control Systems
Within Yokogawa ProSafe-RS systems, the SNB10D-243/C2UN 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 enables distributed installation close to field equipment while maintaining centralized safety logic execution.
Industrial Applications
The SNB10D-243/C2UN 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 particularly 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 cabling and node addressing
- Maintain grounding and shielding integrity
- Configure redundancy according to system architecture
- Avoid mechanical stress on connectors
- Perform full commissioning and loop checks
Compatible System Components
The SNB10D-243/C2UN 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-243/C2UN | Safety Node Unit | ESB connector configuration | SIS / ESD systems |
| SNB10D-225/CU2N | Safety Node Unit | Higher base variant | Safety systems |
| SNB10D-223/CU2N | Safety Node Unit | Standard SIS node | General applications |
| SNB10D-215/CU2N | Safety Node Unit | Mid-level configuration | Expansion systems |
| SNB10D-213/CU2N | Safety Node Unit | Legacy platform | Older SIS systems |
Key Advantages
- SIL3-oriented safety architecture design
- High-reliability ESB communication system
- Flexible connector configuration for system integration
- Supports redundant power and communication paths
- Distributed I/O architecture for reduced wiring
- Strong diagnostic and fault detection capability
- Designed for continuous 24/7 operation
- Proven performance in harsh industrial environments
- Scalable for large SIS installations
Technical FAQs
What is SNB10D-243/C2UN used for?
It is used as a safety node unit in Yokogawa ProSafe-RS systems for field signal acquisition and ESB-based communication.
Is it a CPU or controller?
No. It is a distributed I/O and communication node, not a processing controller.
What does “/C2UN” mean?
It refers to a connector unit configuration used for ESB bus integration and system connectivity.
Where is it used?
It is used in Safety Instrumented Systems (SIS), including ESD and F&G safety applications.
Conclusion
The Yokogawa SNB10D-243/C2UN Safety Node Unit is an essential component in industrial safety automation systems. It provides reliable field signal acquisition, ESB communication, and power distribution within Yokogawa ProSafe-RS architectures. With its redundant design and SIL-oriented performance, it ensures stable, safe, and continuous operation in demanding industrial environments.