Yokogawa SNB10D-245/CU2T – Safety Node Unit with Dual-Redundant Power Supply

The Yokogawa SNB10D-245/CU2T is a safety node unit. Specifically, this unit is rack mountable for centralized installation. It belongs to the Yokogawa safety control system family. Furthermore, it features dual-redundant power supply for high availability. Consequently, this node unit delivers reliable performance for safety instrumented functions.

Ordering Configuration and Suffix Codes

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

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

• Suffix Code 4: 24 V DC power supply.

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

• Option Code CU2T: Connector Unit with Terminator for ESB Bus (Part number: S9343FA).

• Mounting: Rack mount with four M5 screws.

• Insulation Bushes: Included as accessories.

• Weight: 5.9 kg.

• Therefore, the Yokogawa SNB10D-245/CU2T offers flexible configuration for safety applications.

Power Supply Specifications

• Power Supply Voltage: 24 V DC (specified by suffix code 4).

• Power Supply Type: Dual-redundant configuration (suffix code 2).

• Redundancy Benefit: Continuous operation during power supply failure.

• Software License: Included for node expansion (R3).

• Alternative Voltages Available: 100-120V AC, 220-240V AC (different suffix codes).

• Frequency: 50/60 Hz for AC versions.

• Thus, the SNB10D-245/CU2T provides resilient power for critical safety loops.

Power Consumption (24V DC Version)

• Current Consumption: 5.5 A at 24 V DC.

• Power Calculation: Approximately 132 W nominal.

• AC Version Reference: 200 VA (100-120V), 230 VA (220-240V).

• Application: Powers the safety node unit and connected I/O.

• Consequently, proper power supply sizing is essential for reliable operation.

ESB Bus Connection and Terminator

• Option Code CU2T: Connector Unit with Terminator for ESB Bus.

• Part Number: S9343FA.

• Function: Terminates the ESB bus communication line.

• Purpose: Ensures proper signal integrity on the safety bus.

• Installation: Connects directly to the safety node unit.

• Therefore, the Yokogawa SNB10D-245/CU2T includes complete bus termination.

Connectable Safety Node Units

• With SEC402 ESB Bus Coupler Module: Up to 13 safety node units connectable.

• Compatible Safety Control Units: S2SC70S, S2SC70D, SSC60S, SSC60D.

• With SEC401 ESB Bus Coupler Module: Up to 9 safety node units connectable.

• Expansion License: R3 software license included (suffix code 2).

• Application: Scalable safety system architecture.

• Thus, the SNB10D-245/CU2T supports system expansion up to 13 nodes.

Environmental Specifications

• ISA Standard G3 Compliance: Yes (suffix code 5).

• Corrosion Resistance: Suitable for moderate corrosive atmospheres.

• Operating Temperature Range: -20°C to +70°C.

• Explosion Protection: None (suffix code 5 indicates no explosion protection).

• Application Environment: Industrial safety systems in harsh conditions.

• Moreover, the Yokogawa SNB10D-245/CU2T withstands demanding environmental challenges.

Mechanical Specifications and Mounting

• Mounting Type: Rack mountable.

• Mounting Hardware: Four M5 screws required.

• Insulation Bushes: Included as accessories for electrical isolation.

• Mounting Surface: Standard equipment rack or panel.

• Weight: 5.9 kg (approximately 13 lbs).

• Durability: Designed for permanent installation in control rooms.

• Therefore, secure rack mounting ensures stable operation.

Installation Guide

First, verify that the mounting surface can support 5.9 kg weight. Then, prepare four M5 mounting holes at the correct spacing. After that, install the insulation bushes (included accessories) into the mounting holes. Next, position the Yokogawa SNB10D-245/CU2T onto the prepared rack. Secure the unit using four M5 screws. Do not overtighten the mounting hardware. Then, connect the 24 V DC dual-redundant power supply to the unit. Ensure the power supply can deliver 5.5 A continuously. After that, connect the ESB bus cable to the CU2T connector unit. The terminator (S9343FA) is already integrated with this option. Then, connect up to 13 safety node units (or 9 with SEC401) via the ESB bus. Subsequently, configure the node expansion using the R3 software license. Finally, power on the unit and verify communication with the safety control unit. As a result, the Yokogawa SNB10D-245/CU2T will provide reliable safety node functionality.

Packaging List

• One Yokogawa SNB10D-245/CU2T safety node unit (rack mountable)

• One CU2T connector unit with ESB bus terminator (S9343FA, installed)

• Four insulation bushes for mounting (accessories)

• Four M5 mounting screws

• One R3 node expansion software license documentation

• One product installation and configuration guide

Common FAQs

Q1: What power supply configuration does the SNB10D-245/CU2T use?
A: This unit uses dual-redundant power supply (suffix code 2). Specifically, it operates on 24 V DC (suffix code 4). Therefore, failure of one power supply does not interrupt operation.

Q2: How many safety node units can connect to this system?
A: Up to 13 safety node units connect using SEC402 bus coupler module. With SEC401 bus coupler, up to 9 units connect. Consequently, system scalability depends on your ESB bus coupler choice.

Q3: What environmental ratings does the Yokogawa SNB10D-245/CU2T have?
A: Suffix code 5 provides ISA Standard G3 compliance. Operating temperature ranges from -20°C to +70°C. However, no explosion protection is included.

Q4: What is the purpose of the CU2T option code?
A: Option code CU2T includes a Connector Unit with Terminator for ESB Bus. The part number is S9343FA. Therefore, it provides both connection and proper bus termination.

Q5: How is the Yokogawa SNB10D-245/CU2T mounted?
A: This unit is rack mountable using four M5 screws. Insulation bushes are included as accessories. Always use the insulation bushes for proper electrical isolation.