Yokogawa SNB10D-425/CU2N high-reliability Safety Node Unit
The Yokogawa SNB10D-425/CU2N is a high-reliability Safety Node Unit designed as a critical component within the Yokogawa ProSafe-RS Safety Instrumented System (SIS). It functions as an interface hub, connecting field I/O modules to the safety control unit via the Enhanced Serial Bus (ESB)
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | SNB10D-425/CU2N |
| Product Type | Safety Node Unit for ProSafe-RS SIS |
| Bus Interface | Dual-Redundant Enhanced Serial Bus (ESB) |
| I/O Capacity | Supports up to 16 I/O modules (hot-swappable) |
| Power Supply | Dual-redundant, 24 V DC |
| Power Consumption | Approx. 50 W |
| Redundancy | Full dual-redundant (power & communication) |
| Safety Rating | IEC 61508 SIL 3 capable |
| Environmental Rating | ISA G3, suitable for harsh environments |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -40°C to +85°C |
| Humidity | 5–95% RH, non-condensing |
| Mounting | 19-inch standard rack |
| Dimensions (W x H x D) | 210 mm x 222 mm x 420 mm |
| Weight | Approx. 10 kg |
| Certifications | CE, ATEX, IECEx, TÜV SIL3 |
| Key Features | Fast fault detection (<50ms switchover), advanced diagnostics, galvanic isolation, wide operating temperature range |
Primary Applications
The SNB10D-425/CU2N is certified for SIL 3 safety applications, making it ideal for industries where risk mitigation is paramount:
- Oil & Gas: Refineries, offshore platforms, and pipeline safety shutdown systems.
- Petrochemical & Chemical: Process unit emergency shutdown (ESD) and fire & gas protection (F&G).
- Power Generation: Boiler safety, turbine protection, and nuclear plant auxiliary safety systems.
- Pharmaceuticals & Specialty Chemicals: Safe handling of reactive materials and batch processes.
- Metals & Mining: High-temperature process safety and emergency ventilation control.
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