Yokogawa SNB10D-223/CU2N ProSafe-RS Safety Node Unit
The Yokogawa SNB10D-223/CU2N, also cataloged as the SNB10D Safety Node Unit, operates as a dedicated hardware component for safety I/O expansion signal distribution and power delivery within Yokogawa ProSafe-RS platforms.
Suffix Breakdown & Model Matrix
| Suffix / Option Code | Option | Description |
|---|---|---|
| SNB10D | Base Model | Safety Node Unit chassis for ProSafe-RS SIS |
| -2 | Power Supply Voltage | 100 V AC to 120 V AC line voltage rating |
| 2 | Power Redundancy | Dual-redundant power supply configuration |
| 3 | Hardware Setup | Mounting and internal bus compliance specification |
| ** /CU2N** | Option Code | Specialized connector / interface option variant |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SNB10D-223/CU2N |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.52 kg to 8.0 kg (chassis base to fully populated rack) |
| Dimensions | 18.4 cm x 15.0 cm x 3.0 cm (base unit footprint) |
| Operating Temp | -20 deg C to 70 deg C (ISA G3 compliant) |
| Power Consumption | 200 VA maximum |
| Input Line Voltage | 100 V AC to 120 V AC (50/60 Hz) |
| System Compatibility | Yokogawa ProSafe-RS Safety Instrumented System (SIS) |
| Slot Capacity | Up to 8 safety I/O module slots plus dedicated power/bus slots |
| Bus Architecture | Dual-redundant ESB Bus / ER Bus communication interface |
| Safety Compliance | SIL3 capable in ProSafe-RS Safety Control Station configuration |
| Mounting Format | Standard 19-inch panel rack mounting |
4-20 mA HART Loop Protocol and Channel Isolation
The SNB10D-223/CU2N safety node unit routes analog inputs, 4-20 mA HART loop protocol parameters, and discrete field signals across backplane isolation barriers to the central Safety Control Station (SCS). High-integrity photocoupler circuits enforce channel-to-channel isolation and field-to-system galvanic separation, preventing electrical transients from propagating across safety logic loops. Continuous diagnostic loops monitor backplane power levels, transceiver state integrity, and I/O module health to ensure deterministic safety execution.
Frequently Asked Questions
Q: How does the dual-redundant power module design maintain safety execution during a single AC line drop?
A: The chassis houses two isolated power supply units fed by independent 100-120 V AC sources. If one line or power module fails, the redundant module instantly handles the total internal backplane load without triggering false trips or dropping communication with the SCS.
Q: Can safety I/O modules installed within the SNB10D-223/CU2N rack be replaced without de-energizing the safety system?
A: Hot-swapping supported I/O modules within an active SNB10D chassis is permitted, provided field technicians follow proper ESD grounding protocols and verify that the SCS recognizes the module removal state beforehand.
Field Installation Guidelines
Position the SNB10D-223/CU2N unit inside a 19-inch instrument cabinet frame. Secure the chassis using all four rack-mounting screws to resist cabinet vibration and maintain ground continuity.
Connect both 100-120 V AC feed lines to their respective power terminal connections. Route dual ESB Bus cables in separate wiring conduits to protect redundant signal pathways from simultaneous mechanical damage, and ground all cable shield drain wires at the main cabinet earth bar.
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.
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Maintenance Manager, USAReliable 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.
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Engineering Lead, GermanyTop-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.
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