The SNB10D is a “Safety Node Unit” (rack-mountable) — designed for use in a safety instrumented system (SIS), typically with Yokogawa’s ProSafe‑RS.

SNB10D-415/CU2N specifically is a variant with dual-redundant power supply and ESB-bus connection via the “CU2N” connector unit.Acts

as interface between field I/O modules (analog inputs, contact/digital I/O) and the safety controller (via ESB bus). It transmits field signals

 (analog & contact) to the safety controller (SCU).Supports a safety-rated architecture: SNB10D units are part

of the ProSafe-RS SIS, with compliance to safety standards (see below).

Frequently Asked Questions

Q: What safety standard / integrity level does it comply with?
A: SNB10D is part of the safety-instrumented architecture compliant with safety standards; the SNB10D family

supports SIL 3 safety integrity level (as per its specification sheet).

Q: What does “dual-redundant power supply” mean for SNB10D?
A: The unit includes two power-supply modules (redundancy), so if one fails, the other keeps supplying

power — improving reliability and ensuring continuous operation,

which is critical for safety-related systems.

Q: How many SNB10D units can be connected to a single safety controller (SCU)?
A: According to the specs, up to 13 safety-node units (SNB10D) can be connected to certain safety control units

(e.g. S2SC70S/S2SC70D/SSC60S/SSC60D) using the ESB-bus coupler module

 SEC402. With a different coupler (SEC401), up to 9

 units may be supported.

Q: Is SNB10D-415/CU2N suitable for hazardous / explosion-risk environments?
A: The standard suffix “5” indicates a basic type with no explosion protection (“no explosion-proof”). To use

in hazardous environments, an explosion-proof variant (with suffix “E” and appropriate

 option, and /ATDOC) must be selected per manufacturer’s ordering guide.