Product Overview

The Yokogawa SNB10D-225/CU2N is a safety node unit. This rack-mountable device is designed for safety control systems. It connects to Yokogawa safety control units via the ESB bus.

The unit includes a dual-redundant power supply with a software license for node expansion. Furthermore, it carries an ISA Standard G3 environmental rating for harsh conditions. Therefore, this safety node unit suits demanding industrial safety applications.

Ordering Information Breakdown

The SNB10D-225/CU2N follows a specific suffix and option code structure. Understanding these codes helps verify correct configuration.

• SNB10D: Safety Node Unit (Rack Mountable Type).

• -2: Dual-redundant power supply with software license for node expansion (R3).

• 2: 220 to 240 V AC power supply.

• 5: ISA Standard G3 and temperature (-20 to 70°C) with no explosion protection.

• CU2N: Connector Unit for ESB Bus [Part number: S9342FA].

General Specifications

The SNB10D-225/CU2N offers robust safety node capabilities.

• Manufacturer: Yokogawa.

• Product Type: Safety Node Unit.

• Mounting Method: Rack mounting (with four M5 screws, insulation bushes accessories).

• Dimensions (L x W x H): 20.5 cm x 48.2 cm x 22.1 cm.

• Weight: 5.9 kg.

Power Supply Specifications

The SNB10D-225/CU2N offers multiple power supply options depending on suffix codes.

Suffix Code 2 (220-240V AC):

• Voltage: 220 to 240 V AC with 50/60 Hz frequency.

• Power Consumption: 230 VA.

Alternate Options (for reference):

• 100-120V AC specification: 200 VA.

• 24V DC specification: 5.5 A.

For the SNB10D-225/CU2N, the second suffix code "2" specifies the 220-240V AC power supply.

Safety Node Capacity

The SNB10D-225/CU2N connects to safety control units with varying capacities.

• With SEC402 ESB bus coupler module: Up to 13 safety node units can be connected to S2SC70S/S2SC70D/SSC60S/SSC60D safety control units.

• With SEC401 ESB bus coupler module: Up to 9 safety node units can be connected.

Therefore, the number of node units depends on which ESB bus coupler is used in the safety control unit.

Environmental Specifications

The SNB10D-225/CU2N is built for harsh environments.

• Suffix Code 5: ISA Standard G3 rating.

• Temperature Range: -20 to 70°C.

• Explosion Protection: None (safe area only).

Consequently, this unit withstands corrosive atmospheres (ISA G3) and extreme temperatures, making it suitable for chemical and process industry installations.

Included Option: CU2N Connector Unit

The SNB10D-225/CU2N includes the CU2N option.

• CU2N: Connector Unit for ESB Bus.

• Part Number: S9342FA.

Thus, the module ships ready to connect to the ESB bus without ordering additional adapters.

Key Features

The SNB10D-225/CU2N offers several advantages for safety system installations.

Dual-Redundant Power Supply:
The -2 suffix specifies dual-redundant power supplies. Therefore, if one power supply fails, the other continues operation without interruption.

Software License for Node Expansion:
The same -2 suffix includes a software license for node expansion (R3). Consequently, additional safety nodes can be added as the system grows.

ISA Standard G3 Rating:
The -5 suffix provides ISA G3 corrosion resistance. Hence, the unit operates reliably in environments with moderate levels of corrosive gases.

Extended Temperature Range:
Rated for -20 to 70°C operation. For this reason, it suits outdoor or unconditioned enclosures.

ESB Bus Connectivity:
Connects to safety control units via the ESB bus. Thus, it integrates into Yokogawa's ProSafe-RS safety system architecture.

Rack Mountable Design:
Mounts in a standard 19-inch rack using four M5 screws. Insulation bushings are included as accessories. Therefore, installation is straightforward.

CU2N Connector Included:
The /CU2N option provides the ESB bus connector unit (S9342FA). Consequently, no separate ordering is required for ESB bus connection.

Typical Applications

The SNB10D-225/CU2N suits various safety system applications.

• Emergency shutdown (ESD) systems in process plants.

• Fire and gas detection systems.

• Burner management systems (BMS).

• High-integrity pressure protection systems (HIPPS).

• Turbine and compressor safety control.

Installation Guidelines

Install the SNB10D-225/CU2N in a standard 19-inch rack. First, attach the insulation bushings (included as accessories). Then, secure the unit using four M5 screws.

Connect the 220-240V AC power supply to the appropriate terminals. The power consumption is 230 VA. Verify the supply is within tolerance.

Connect the ESB bus using the included CU2N connector unit (S9342FA). The number of node units depends on the ESB bus coupler module (SEC401 or SEC402) in the safety control unit.

The unit operates in ambient temperatures from -20 to 70°C. For ISA G3 environments, no additional corrosion protection is needed.

What is in the Box

Please inspect all items upon delivery.

• Yokogawa SNB10D-225/CU2N safety node unit.

• CU2N connector unit for ESB bus (S9342FA).

• Insulation bushes for rack mounting (accessories).

• Installation instruction manual.

Frequently Asked Questions (FAQ)

1. What power supply option does the SNB10D-225/CU2N have?

The SNB10D-225/CU2N includes a dual-redundant power supply. The -2 suffix specifies this configuration. The second "2" suffix specifies 220-240V AC power.

2. How many safety node units can be connected?

Using SEC402 ESB bus coupler modules, up to 13 safety node units can be connected. With SEC401 modules, up to 9 units can be connected. Therefore, capacity depends on the coupler used.

3. What is the ISA G3 rating for this module?

The -5 suffix provides ISA Standard G3 rating. Consequently, the SNB10D-225/CU2N withstands moderate levels of corrosive gases, making it suitable for chemical and industrial environments.

4. What is the operating temperature range of this unit?

The SNB10D-225/CU2N operates from -20°C to 70°C. The -5 suffix specifies this extended temperature range.

5. What does the CU2N option include?

The /CU2N option includes a connector unit for the ESB bus (part number S9342FA). Therefore, the module is ready to connect to the ESB bus without additional ordering.