Technical Overview
The SNB10D-425 (configuration SNB10D-425/CU2T) is a high-integrity Safety Node Unit designed for the Yokogawa ProSafe-RS Safety Instrumented System (SIS). This rack-mountable chassis forms the hardware interface between field instrumentation and the Safety Control Unit (SCU).
The unit supports the transmission of analog and digital safety signals over the ESB bus while supplying regulated power to installed safety I/O modules. Engineered for SIL 3 applications, it ensures continuous safety monitoring, logic execution, and emergency shutdown functionality in mission-critical environments.
Detailed Specifications
| Item | Specification |
|---|---|
| Model Number | SNB10D-425 |
| System Compatibility | ProSafe-RS SIS |
| Bus Interface | ESB Bus (via SEC401 or SEC402) |
| Maximum Node Expansion | Up to 13 units (SEC402 with S2SC70S/D, SSC60S/D) |
| Up to 9 units (SEC401) | |
| Input Power (Selectable) | 100–120 VAC or 220–240 VAC, 50/60 Hz |
| 24 VDC | |
| Power Consumption | 200 VA @ 100–120 VAC |
| 230 VA @ 220–240 VAC | |
| 5.5 A @ 24 VDC | |
| Mounting | 19-inch rack mount (4 × M5 screws with insulation bushes) |
| Operating Temperature | −10 °C to +55 °C |
| Weight | 5.9 kg |
Core Functionality & Deployment
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Serves as the I/O housing platform for ProSafe-RS safety modules
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Interfaces with sensors and final control elements in SIL-rated loops
-
Supports distributed safety architectures using SEC401 or SEC402 couplers
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Provides stable internal power distribution for high-density I/O configurations
-
Designed for continuous operation in demanding industrial safety applications
Application
-
Emergency Shutdown (ESD) systems
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Burner Management Systems (BMS)
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Turbine and compressor protection
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High-risk process units requiring SIL 3 compliance
Technical FAQ
What does the “/CU2T” suffix indicate?
The /CU2T designation identifies specific hardware options, typically including power connector configuration and ISA G3 corrosion-resistant coating for harsh environments.
Does the SNB10D-425 support redundant power?
Yes. The unit is designed to accept dual-redundant power supply modules, improving availability and fault tolerance.
Can this unit be used with CENTUM VP?
No. Although mechanically similar to some CENTUM components, the SNB10D-425 is exclusively certified for ProSafe-RS to comply with IEC 61508 functional safety requirements.
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