Product Description

The SNB10D-223/CU2N is a rack-mountable Safety Node Unit designed by Yokogawa for the ProSafe-RS Safety Instrumented System (SIS). Serving as a local I/O expansion hub, it enables secure communication between field devices and the central safety controller. Built for high-availability environments, this version supports 100–120 V AC input and features ISA Standard G3 conformal coating for enhanced resistance to corrosive gases. The unit is ideal for Emergency Shutdown (ESD) and Fire & Gas (F&G) systems in harsh industrial sectors such as oil & gas and chemical processing.

Technical Specifications

Industrial Application and Integration

The SNB10D-223/CU2N is widely deployed in:

• Emergency Shutdown (ESD) systems for oil & gas, chemical, and petrochemical plants

• Fire & Gas (F&G) systems, integrating sensors and actuators with SIL3-rated safety loops

• Intermediate ESB bus nodes, where signals continue to downstream nodes via the non-terminating /CU2N connector

Its dual-redundant power architecture ensures continuous operation even if one power source fails. The G3 conformal coating protects against corrosion from sulfur dioxide, hydrogen sulfide, and other harsh gases, extending the lifespan of the module in demanding environments.

Technical FAQs

1. What does the G3 rating signify?
It indicates that the internal circuit boards are coated to resist corrosion from industrial gases such as H₂S and SO₂.

2. Is the SNB10D-223/CU2N hot-swappable?
The I/O modules within the node are generally hot-swappable. The node itself should remain powered with redundant communication and power paths to ensure uninterrupted safety loop operation.