Product Description

The SNB10D-223 is a high-availability safety node chassis designed for the Yokogawa Electric Corporation ProSafe-RS Safety Instrumented System (SIS) platform.

This unit functions as a remote safety I/O expansion node, providing housing and connectivity for safety-certified input/output modules. It serves as the physical and communication bridge between field instrumentation and the central Safety Control Station (SCS).

The SNB10D-223 utilizes a dual-redundant architecture for both power supply and safety communication buses, significantly improving system availability. Even if a localized hardware failure occurs, safety logic supervision remains uninterrupted.

The chassis supports ESB and ER bus communication, enabling high-integrity safety data transmission across distributed control zones such as satellite instrument houses and remote field cabinets.

Technical Specifications

Primary Application Scenarios

The SNB10D-223 is widely used in:

• Emergency Shutdown (ESD) systems

• Fire & Gas (F&G) safety monitoring systems

• Offshore oil and gas platforms

• LNG processing facilities

• Petrochemical refineries

It is particularly useful in distributed safety architectures, where I/O modules must be located close to field devices while maintaining secure communication with centralized safety logic.

Frequently Asked Questions

What does the "223" suffix indicate?
The suffix typically represents configuration coding:

• 2 → 100–120 V AC power supply

• 2 → Dual-redundant power configuration

• 3 → Specific mounting and safety compliance configuration

Can the SNB10D-223 operate without redundancy?
Technically yes, but for SIL3 safety applications, redundant power supplies and communication paths are strongly recommended to eliminate single points of failure.

What bus systems does it support?
The unit supports ESB and ER safety communication buses, which are used for high-integrity SIS data exchange.