YOKOGAWA SNB10D-425/CU2T ProSafe-RS Safety Node Unit
The YOKOGAWA SNB10D-425/CU2T, also cataloged as the SNB10D Safety Node Unit, operates as a dedicated hardware component for field I/O signal transmission and redundant safety execution within ProSafe-RS SIS and CENTUM VP platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SNB10D-425/CU2T |
| Brand | YOKOGAWA |
| Origin | Japan |
| Weight | 5.9 kg |
| Dimensions | 48.2 x 20.5 x 22.1 cm |
| Operating Temp | -20 deg C to +70 deg C |
| Power Consumption | 230 VA |
| Supply Voltage | 220 V AC to 240 V AC (dual-redundant) |
| Communication Bus | ESB bus via CU2N connector unit (S9342FA) |
| Safety Integrity Level | SIL2/SIL3 (IEC 61508) |
HART Communication Loops and Fieldbus Connectivity
Internal ESB bus interfaces establish deterministic real-time communication between installed safety I/O modules and the main safety control unit. Optocoupler arrays provide optical isolation across internal backplane lines, which protects logic processing circuits from field-side voltage transients. Integrated power distribution tracks feed regulated voltage to attached I/O cards, while cold junction compensation circuits on compatible analog channels stabilize thermocouple sensor loops during ambient temperature shifts.
Frequently Asked Questions
Q: How do engineers configure the dual-redundant power supplies to maintain continuous safety node execution during a supply phase failure?
A: Installers connect separate AC feed lines to the two independent power input terminals on the rear panel. Consequently, if one AC line loses power, the secondary power supply unit picks up the entire 230 VA load immediately, which prevents node reset cycles.
Q: What procedure ensures proper cable shield grounding for the ESB bus connector unit (CU2N)?
A: Technicians must clamp the braided shield of the ESB bus cable directly to the metal housing of the CU2N connector using the built-in grounding clip. In addition, operators must ground the entire 19-inch rack chassis to the plant protective earth grid to suppress electromagnetic noise.
Q: How does the system handle an I/O module replacement without interrupting active safety loop execution?
A: The backplane architecture supports online module exchange. Once technicians unlatch the retaining mechanism, the internal logic isolates the target slot, whereupon the redundant controller retains active safety loop execution across parallel channels.
Field Installation Guidelines
Mount the unit horizontally into a standard 19-inch instrument rack, then secure the front panel using four M5 screws tightened to specified torque limits. Maintain a minimum vertical clearance of 50 mm above and below the rack chassis to permit unhindered airflow through the ventilation slots.
Route field signal cables and ESB bus communication cables through separate wire channels to prevent inductive noise coupling. Strip signal wire leads clean, clamp cable braid shields to the main cabinet ground bus bar, and verify that the protective earth (PE) terminal exhibits a low-resistance path to the facility grounding system before applying 220-240 V AC power.
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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Operations Director, GermanyRelated Products
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