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ABB NDBU-95 63985341 Fiber Branch Unit
ABB NDBU-95 63985341
The NDBU‑95 is a Fiber Optic Branching Unit provided by ABB for DCS800/DDCS systems, designed to enable fiber optic communication between a master station and up to 9 slave stations in a star topology. It can maintain normal communication of the remaining channels when the master station fails or a single slave station loses power, thereby enhancing the reliability and fault tolerance of the system.
Main Technical Parameters
- Number of Channels: 1 master channel + 9 slave channels
- Transmission Rate: 1–4 MBd (fiber optic rate is programmable)
- Drive Current: 20 mA, 30 mA, 50 mA optional, maximum input current is approximately 300 mA
- Power Supply: +24 V DC, with a tolerance of ±10%
- Operating Temperature: 0 °C – 50 °C
- Protection Class: IP67 (dustproof and waterproof)
- Dimensions: Approximately 264 mm × 84 mm × 50 mm (L × W × H)
- Indicator Lights: Each channel is equipped with a green LED to display data reception status
Product Features
- High Reliability: The star topology ensures that a single point of failure does not affect the entire network.
- Compact and Robust: The metal housing with IP67 protection class is suitable for harsh industrial environments.
- Easy Installation and Configuration: Adopts standard M12×1 electrical connections and G 1/2″ process interfaces, supporting quick wiring.
- Multi-Protocol Compatibility: Compatible with common industrial communication protocols such as ControlNet, Ethernet, Modbus, and Profinet.
- Programmability: Transmission rate, drive current, and channel functions can all be configured via software.
- Smart Performance: Delivers intelligent signal management for stable industrial communication.
Structure and Composition
- Fiber Optic Adapter Module: Responsible for the transmission and reception of optical signals as well as electrical isolation.
- Channel Board: Each channel is equipped with an independent LED indicator, drive circuit, and address register.
- Power Supply Module: Provides stable +24 V DC power and has overcurrent protection.
- Case and Mounting Bracket: The metal housing is matched with DIN rail or panel mounting holes for easy fixation inside the control cabinet.
Typical Application Fields
- Industrial Automation: Distributed control of drive systems, frequency converters, and servo systems.
- Process Control: Fieldbus networks for continuous production processes in chemical, petroleum, metallurgical, and other industries.
- Energy Management: Real-time monitoring and control of power plants and distribution automation systems.
- Large-Scale Machinery: High-speed data acquisition and command issuance for CNC machine tools, printing and packaging equipment.
Installation Key Points
- Location: It should be installed inside a control cabinet with good ventilation, away from strong magnetic fields and high temperatures.
- Wiring: Use standard M12×1 electrical connectors, and corresponding fiber optic jumpers for fiber optic ports, ensuring that the fiber optic bending radius complies with specifications.
- Grounding: The housing must be reliably grounded to prevent electrostatic discharge from interfering with fiber optic signals.
- Address Configuration: Assign a unique address to each slave station through the configuration software provided by ABB to avoid address conflicts.
- Debugging: Check whether the LED indicator of each channel lights up normally, and use the diagnostic function of DCS800/ACS800 to verify communication integrity.
Maintenance Recommendations
- Regular Inspection: Check fiber optic connections, LED indicators, and power supply every 6–12 months.
- Clean Fiber Optic End Faces: Use special fiber optic cleaning tools to prevent signal attenuation caused by dust.
- Firmware Upgrade: Pay attention to the firmware updates released by ABB official and upgrade in a timely manner to obtain the latest compatibility and security improvements.
- Spare Parts Management: It is recommended to keep at least one set of NDBU‑95 and corresponding fiber optic jumpers on-site for quick replacement of faulty units.
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