The Yokogawa SNB10D-445/CU2T Safety Node Unit is a modular, rack-mounted interface unit designed for integration into the ProSafe-RS safety instrumented system. It ensures secure and high-speed communication between field I/O modules and the safety control unit via the optical ESB bus. The unit supports fault-tolerant performance in critical industrial environments, enabling reliable signal transmission and system power supply for I/O modules.

Technical Specifications

Applications

• Safety-critical process monitoring in chemical, petrochemical, and power industries

• Interface for transmitting analog and contact signals from field devices to the safety control unit

• Provides power and communication to multiple I/O modules within the ProSafe-RS system

• Suitable for redundant, fault-tolerant safety system architectures

Advantages

• Modular design allows flexible expansion and easy maintenance

• High-speed, reliable communication via optical ESB bus

• Supports multiple safety node units in a single network for scalability

• Rugged construction suitable for industrial temperature and humidity ranges

• Redundant power supply ensures continuous operation

• Reduces system downtime through fault-tolerant design

FAQ

1. What is the maximum number of safety nodes that can be connected to a control unit?

Up to 13 nodes with the SEC402 coupler module or 9 nodes with the SEC401 coupler module.

2. What types of signals does the SNB10D-445/CU2T handle?

It transmits analog input signals and contact signals from field devices.

3. Can the unit operate in harsh industrial conditions?

Yes, it supports temperatures from -20°C to +70°C and humidity of 10–90% non-condensing.

4. What is the power supply configuration?

Dual-redundant AC input (220–240 V) for high reliability.

5. What type of communication bus does the unit use?

Optical ESB bus for fast and secure signal transmission.

6. How is the unit mounted?

It is rack-mountable and designed for industrial control cabinets.

7. Does the unit support modular expansion?

Yes, additional power modules, ESB bus interface modules, and I/O modules can be added.

8. What is the maximum transmission distance over the optical bus?

Up to 5 kilometers using ANT401 fiber-optic cables.

9. How heavy is the SNB10D-445/CU2T?

Approximately 5.9 kg.

10. Are there limitations on the number of connected I/O modules?

The number depends on the system configuration, power supply capacity, and coupler module used.