SNB10D-225/CU2N Yokogawa Safety Node Unit

SNB10D-225/CU2N Yokogawa ProSafe-RS Safety Node Unit

SNB10D-225/CU2N Yokogawa ProSafe-RS Safety Node Unit

Availability: 10 left in stock

Yokogawa SNB10D-225/CU2N Safety Node Unit Configured for distributed safety I/O expansion in ProSafe-RS safety instrumented systems, the Yokogawa SNB10D-225/CU2N (SNB10D...

SKU: SNB10D-225/CU2N

Manufacturer: Yokogawa
Product No.: SNB10D-225/CU2N
Product Type: Safety Node Units
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 5900g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa SNB10D-225/CU2N Safety Node Unit

Configured for distributed safety I/O expansion in ProSafe-RS safety instrumented systems, the Yokogawa SNB10D-225/CU2N (SNB10D Safety Node Unit) provides direct physical/electrical execution. This rack-mounted chassis houses up to 8 safety I/O modules, establishing dual-redundant electrical ESB bus interconnections to primary Safety Control Units (SCUs). By enforcing hardware-level signal isolation and executing duplex communication link protocols across local node networks, the assembly guarantees deterministic safety trip signal propagation without compromising network integrity.

Suffix Breakdown & Model Matrix

Code Section	Value	Designator Description
Base Model	SNB10D	Safety Node Unit Chassis
Suffix Code 1	-2	Dual-redundant power supply with software license for node expansion (R3)
Suffix Code 2	2	220 to 240 V AC power supply
Suffix Code 3	5	ISA Standard G3 compliant, -20 to 70 deg C storage rating, non-explosion protection
Option Code	/CU2N	Connector Unit for ESB Bus (Part Number: S9342FA), non-terminator variant

Hardware Specifications

Parameter	Specification
Model	SNB10D-225/CU2N
Brand	Yokogawa
Origin	Japan
Role / Type	Safety Node Unit (SNU)
System Compatibility	ProSafe-RS Safety Instrumented Systems
Module Capacity	Up to 8 safety I/O modules
Input Voltage	220 to 240 V AC
Power Consumption	1.5 A to 2.0 A (load dependent)
Power Supply Architecture	Dual-redundant
Communication Interface	Dual ESB bus (electrical, duplex)
Max Bus Distance	100 m per electrical ESB segment
Network Topology	Star or Bus
Bus Connector Unit	S9342FA (CU2N, non-terminator)
Isolation	Galvanic isolation between ESB bus and backplane logic
Dimensions (W x H x D)	482.6 mm x 132.5 mm x 177.0 mm (Enclosure: 48.2 cm x 22.1 cm x 20.5 cm)
Net Weight	5.9 kg
Shipping Weight	8.0 kg
Operating Temperature	0 to 55 deg C (special derating/mounting rules apply up to 70 deg C)
Storage Temperature	-20 to 70 deg C
Environmental Standard	ISA Standard G3 conformal coating
Safety & Compliance	IEC 61508 SIL3, CE, UL

SIL3 Certified Dual-Redundant ESB Bus Interfacing

The SNB10D-225/CU2N chassis incorporates high-integrity channel-to-channel and bus-to-logic galvanic isolation to prevent ground loops and high-voltage surge propagation from degrading system logic. Engineered to meet IEC 61508 SIL3 certification standards, the integrated backplane routes analog and digital safety loops while maintaining cold junction compensation (CJC) path accuracy for critical temperature elements. The dual-redundant ESB bus interface facilitates continuous channel-level diagnostic scanning and seamless master-slave fail-safe switching. When coupled with the CU2N connector unit, the rack buffers process signal lines directly against electrical fast transients, ensuring uninterrupted execution of emergency shutdown (ESD) matrix routines.

Frequently Asked Questions

Q: What distinguishes the /CU2N connector option from the /CU2T option on the SNB10D chassis?

A: The /CU2N option installs the S9342FA non-terminator connector unit, which passes the dual ESB bus signals through to downstream safety node units in a daisy-chain or bus topology. The /CU2T option contains built-in bus terminating resistors and must be deployed exclusively at the final physical node on an electrical ESB bus segment.

Q: How does the dual-redundant power supply operate if one AC feed drops?

A: The dual 220 to 240 V AC power modules feed an internal diode-ORed DC bus on the backplane. If one primary AC power supply line drops voltage or fails internally, the secondary module instantly sustains the full 1.5 A to 2.0 A load without interrupting module logic states or triggering false SIL3 safety trips.

Field Installation Guidelines

Mount the unit directly into a standard 19-inch rack enclosure using all four front-flange mounting screws. Maintain a minimum vertical clearance of 50 mm above and below the chassis frame to ensure natural convection cooling across the internal power supply heat sinks. Verify that the AC input line is fused according to Yokogawa distribution guidelines before applying 220 to 240 V AC power.

When wiring the dual electrical ESB bus connectors via the CU2N unit, route the channel A and channel B coaxial cables through independent wireways to prevent simultaneous physical damage. Clamp all cable shields directly to the cabinet functional ground bar using low-impedance grounding straps. Ensure that the total electrical ESB segment length does not exceed 100 m. If the physical distance to the Safety Control Unit exceeds 100 m, connect an optical master module (SNT401) to transition the signal path onto fiber-optic media.

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

Mark Thompson

Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

Robert Hoffmann

Engineering Lead, Germany

Top-tier Service and Quality

We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.