Yokogawa SNB10D-445/CU2T ProSafe-RS Safety Node Unit

Product Overview

The Yokogawa SNB10D-445/CU2T serves as a core infrastructure component for the ProSafe-RS Safety Instrumented System (SIS). This rack-mountable Safety Node Unit facilitates the expansion of safety I/O modules while maintaining the highest integrity levels for emergency shutdown and fire and gas applications. We supply this unit as 100% Brand New and Original, featuring advanced environmental hardening and integrated ESB bus termination to ensure continuous safety logic execution in demanding industrial sectors.

Part Number Breakdown

The SNB10D series employs a specific suffix logic to define power, environmental protection, and expansion capabilities:

• SNB10D: Safety Node Unit (Rack Mountable Type).

• -4: Equipped with a 24 V DC power supply system.

• 4: Features Dual-redundant power supply with a software license for node expansion (R3).

• 5: Conforms to ISA Standard G3 corrosion resistance and extended temperature range (-20 to 70 °C).

• CU2T: Includes a Connector Unit with Terminator for ESB Bus (S9343FA).

Technical Specifications

This unit integrates high-availability power and bus termination within a ruggedized mechanical frame.

Engineering Advantages

• Extended Thermal Performance: The SNB10D-445 configuration supports an ultra-wide operating temperature range from -20 to 70 °C. This allows for installation in remote instrument enclosures (RIEs) or field cabinets that lack strict climate control, reducing the cost of auxiliary cooling and heating systems.

• ISA G3 Corrosion Defense: The module boards feature ISA Standard G3 conformal coating. This chemical barrier prevents copper and silver corrosion caused by harsh industrial gases like $H_2S$ and $SO_2$, ensuring long-term hardware reliability in refineries, chemical plants, and wastewater facilities.

• Simplified Bus Topology: The included CU2T option (S9343FA) provides a dedicated connector unit with an integrated terminator for the ESB bus. This eliminates the need for separate external terminators, simplifying the high-speed safety bus wiring and reducing potential points of failure during system commissioning.

• High-Integrity Redundancy: The dual-redundant power supply configuration prevents system trips caused by a single power fault. Each power module operates independently, allowing for live replacement of a faulty supply without interrupting the safety functions or the node's communication with the safety controller.

FAQs

What is the purpose of the insulation bushes included with the SNB10D?

The insulation bushes isolate the unit from the rack frame. This prevents ground loops and electrical noise from interfering with the safety I/O signals, ensuring the node maintains the strict signal-to-noise ratios required for SIL-rated safety functions.

Does the SNB10D-445/CU2T support node expansion in existing ProSafe-RS systems?

Yes. The "4" suffix includes the software license required for node expansion (R3). This allows the Safety Control Station (SCS) to recognize and integrate additional I/O capacity seamlessly within the ProSafe-RS network.

How do I connect the ESB bus to this unit?

The CU2T unit provides the interface for the ESB bus cables. Since this model includes the "T" (Terminator), you typically install this unit at the end of the ESB bus segment to ensure proper impedance matching and signal reflection suppression.

Is this unit refurbished or previously used in a test lab?

No. We offer only 100% Brand New Yokogawa hardware. Each SNB10D-445/CU2T arrives in its original factory packaging, complete with all standard accessories and an intact serial number to guarantee authenticity and full factory-rated performance.