SNB10D-225/CU2T | Yokogawa | Safety Node Unit

Description

The Yokogawa SNB10D‑225/CU2T, also cataloged as the SNB10D‑225 safety node unit, operates as a rack‑mounted hardware module for ESB‑bus node interfacing and safety‑related signal routing within Yokogawa control architectures. The unit integrates dual‑redundant power capability, ESB bus termination, and G3‑rated environmental tolerance for extended‑temperature installations.

Suffix Breakdown & Model Matrix

• 225:

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

  • 2: 220 to 240 VAC power supply

  • 5: ISA Standard G3, temperature rating ‑20 to 70 deg C, no explosion protection

• CU2T: Connector Unit with Terminator for ESB Bus (Part No. S9343FA)

Hardware Specifications

• Product Number: SNB10D‑225/CU2T

• Brand: Yokogawa

• Product Type: SNB10D Safety Node Unit

• Rack Mounting: Supported

• Power Supply: 220 to 240 VAC (dual‑redundant)

• Environmental Rating: ISA G3, ‑20 to 70 deg C

• Option Module: CU2T ESB bus connector with terminator

• Weight: 5.9 kg

• Shipping Weight: 8 kg

• Series: SNB10D Safety Node Family

• Country of Manufacture: Not specified

4‑20 mA HART Loop Protocol & Channel‑to‑Channel Isolation

• The SNB10D platform supports Yokogawa DCS wiring practices where mixed analog and digital safety signals require stable, low‑noise transmission.

• Channel‑to‑channel isolation is maintained through internal grounding and shielding structures within the CU2T connector unit.

• ESB bus termination provided by CU2T ensures deterministic communication timing across node segments.

• Shield bonding at a single point prevents ground‑loop interference in safety‑critical installations.

Functional Description

• Operates as a safety node unit within Yokogawa ESB bus architectures.

• Provides dual‑redundant power input for high‑availability safety applications.

• CU2T option includes integrated ESB bus termination for end‑of‑line node placement.

• G3 environmental rating supports corrosive and extended‑temperature environments.

• Designed for rack‑mounted installation with fixed slot alignment.

• Supports node expansion licensing (R3) for extended system configurations.

Frequently Asked Questions (FAQ)

• Q: Does the SNB10D‑225/CU2T support hot‑swap installation? A: No. Power must be removed before installing or removing the unit to avoid ESB bus faults.

• Q: Is the CU2T terminator required for all installations? A: It is required when the unit is installed at the end of an ESB bus segment.

• Q: Can the unit operate with non‑redundant power? A: Yes, but the 225 suffix indicates dual‑redundant capability, which should be used in safety‑critical systems.

Field Installation Guidelines

• Ensure the unit is mounted in the designated rack slot to maintain ESB bus alignment.

• Verify shield bonding at a single grounding point to avoid noise coupling into safety channels.

• Confirm CU2T terminator orientation when used as an end‑of‑line node.

• Route AC power wiring separately from ESB bus cables to prevent interference.

• Maintain airflow around the module to support operation up to 70 deg C.

• Apply strain relief to all connectors to prevent mechanical stress during cabinet vibration.