Yokogawa SNB10D-215/CU2T Safety Node Unit
The Yokogawa SNB10D-215/CU2T, also cataloged as the SNB10D Safety Node Unit, operates as a dedicated hardware component for housing safety I/O modules and distributing power across ProSafe-RS SIS platforms.
Suffix Breakdown & Model Matrix
| Code | Option / Specification | Description |
|---|---|---|
| SNB10D | Base Model | Safety Node Unit (Rack Mountable Type) |
| -2 | Power & License | Dual-redundant power supply with software license for node expansion |
| 1 | Power Voltage | 100 to 120 V AC power supply |
| 5 | Protection / Temp | ISA Standard G3 conformal coating, temperature range -20 to 70 deg C, no explosion protection |
| /CU2T | Option Code | Connector Unit with Terminator for ESB Bus |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SNB10D-215/CU2T |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 6.0 kg (Net), 8.0 kg (Shipping) |
| Dimensions | 19-inch rack-mountable chassis (4U height profile) |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | 200 to 230 VA (100 to 120 V AC) |
| System Platform | ProSafe-RS SIS |
| Power Supply Redundancy | Dual-redundant power supply modules built-in |
| Communication Bus | ESB bus via /CU2T connector unit with terminator |
| Environmental Coating | ISA Standard G3 |
| Safety Integrity Level | SIL2 / SIL3 certified (IEC 61508) |
Process Control and DCS Connectivity
The SNB10D-215/CU2T safety node unit routes deterministic signal channels between installed safety I/O cards and the master safety control unit over the ESB bus interface. The integrated /CU2T connector unit provides line termination to stabilize high-speed bus communication and suppress signal reflections. High-density backplane isolation prevents noise cross-talk between process loops, ensuring high conversion accuracy for field devices using 4-20 mA HART loop protocol connections and discrete safety interlocks.
Frequently Asked Questions
Q: What function does the /CU2T option code fulfill on the SNB10D-215/CU2T unit?
A: The /CU2T option designates an factory-installed Connector Unit complete with an integrated ESB bus terminator to maintain bus impedance and signal integrity.
Q: How does the internal power supply configuration maintain node availability?
A: The chassis incorporates dual-redundant 100 to 120 V AC power modules, allowing continuous safety operation if one power feed fails.
Field Installation Guidelines
Mount the SNB10D-215/CU2T unit horizontally into a standard 19-inch instrument rack using four dedicated M5 retaining screws. Fasten a heavy-gauge protective earth ground strap directly to the chassis grounding stud prior to applying line power. Attach incoming 100 to 120 V AC power feeds to separate primary and secondary terminal blocks to establish full power redundancy. Connect ESB bus extension cables to the /CU2T connector unit, taking care not to exceed maximum cable bend radii or run bus lines alongside high-voltage AC cables. Ensure cabinet ventilation leaves at least 100 mm of open clearance above and below the rack frame for natural thermal dissipation across the -20 to +70 deg C operating window.
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