Yokogawa SNB10D-425/CU2T Safety Node Unit

Main Functions

The SNB10D platform accommodates power supply modules, ESB bus interface modules and I/O modules. Its power supply and ESB bus interface sections use dual-redundant configurations. This arrangement provides two power supply paths and two bus interface paths within the node unit.

The /CU2T option identifies the connector unit with a built-in ESB bus terminator, part number S9343FA. The terminator belongs at the end of an ESB bus connection. It provides the required bus termination when no further node unit connects downstream.

Technical Specifications

Installation and Bus Connection

The SNB10D is designed for 19-inch rack mounting and uses four M5 mounting screws with insulating bushes. The ESB bus connects the node unit to the safety control unit. Yokogawa specifies a YCB301 ESB bus cable of at least 1 m for this connection.

For bus termination, select the connector with a built-in terminator when the SNB10D occupies the final position on the ESB bus. The /CU2T configuration identifies this end-node arrangement.

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Frequently Asked Questions

Q: What does /CU2T mean in SNB10D-425/CU2T?

A: It identifies a connector unit with a built-in ESB bus terminator. Its associated part number is S9343FA, intended for the end of an ESB bus connection.

Q: Does the SNB10D-425/CU2T support dual-redundant power?

A: Yes. The -4 suffix specifies dual-redundant power supply for R4.01 or later system versions.

Q: Does this model have explosion protection?

A: No. The -5 suffix specifies ISA Standard G3 and an environmental temperature range of -20 to +70 deg C without explosion protection.