SNB10D-445/CU2T

The Yokogawa SNB10D-445/CU2T is a rack-mounted Safety Node Unit for the ProSafe-RS Safety Instrumented System (SIS). It provides mounting, power distribution, and ESB bus connectivity for safety I/O modules connected to a Safety Control Unit (SCU). The specified configuration includes dual-redundant power supply support, a 24 V DC input, and an ESB bus connector unit with terminator under part number S9343FA.

Function and ESB Bus Configuration

The SNB10D provides the interface between field I/O modules and the Safety Control Unit through the ESB bus. The node accommodates power supply modules, ESB bus interface modules, and I/O modules. Its dual-redundant power and bus interface arrangement supports the ProSafe-RS node architecture; the exact installed modules must be verified against the system configuration.

The /CU2T option identifies a connector unit with an ESB bus terminator, part number S9343FA. This distinguishes the ordered configuration from /CU2N, which specifies a connector unit without the terminator. Confirm the node's position and bus topology before selecting the connector option.Technical Specifications

Parameter	Specification
Model	SNB10D-445/CU2T
Brand	Yokogawa
Product Type	Safety Node Unit, rack-mountable
System	ProSafe-RS Safety Instrumented System
Safety Integrity Level	SIL 3
Power Supply Configuration	Dual-redundant
Power Supply Input	24 V DC
ESB Bus Interface Modules	SSB401 x 2, as specified for the node configuration
ESB Bus Connector Option	/CU2T, connector unit with terminator
Connector Unit Part Number	S9343FA
Operating Temperature	-20 to 70 deg C
Conformal Coating	ISA Standard G3
Explosion Protection	Standard specification without explosion protection
Mounting	19-inch rack
Mounting Hardware	4 x M5 screws with insulating bushes
Dimensions (H x W x D)	221 x 482.6 x 205 mm
Weight	5.9 kg

Installation and Configuration Notes

• Install the 19-inch rack-mountable unit in a keyed metallic cabinet as specified in Yokogawa's product documentation.

• Use the required ESB bus interface and connector configuration for the target Safety Control Unit.

• Fit an SDCV01 dummy cover in any I/O module slot that is not populated, as specified in the system documentation.

Frequently Asked Questions

Q: What does the /CU2T suffix specify?

A: It specifies an ESB bus connector unit with a terminator, part number S9343FA. The /CU2N option uses a connector unit without a terminator.

Q: Which power supply configuration does the SNB10D-445/CU2T use?

A: The ordering code specifies a 24 V DC input and dual-redundant power supply configuration. Confirm the installed power supply modules and system revision before replacing an existing unit.

Q: Is the SNB10D-445/CU2T suitable for explosive atmospheres?

A: The 5 suffix specifies the standard ISA G3 coating and -20 to 70 deg C temperature range without explosion protection. This configuration should not be treated as an explosion-protected model.

 

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