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

Core Functionality & Deployment

• Serves as the I/O housing platform for ProSafe-RS safety modules

• Interfaces with sensors and final control elements in SIL-rated loops

• Supports distributed safety architectures using SEC401 or SEC402 couplers

• 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

• Burner Management Systems (BMS)

• Turbine and compressor protection

• 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.