ABB NDBU-95 DDCS Star Connection Branching Unit

Description

Technical Specifications

Communication Performance

• Network Topology: Star connection (1 master input, 9 slave outputs)
• Communication Protocol: DDCS (Drive Distributed Control System) (ABB proprietary)ABB
• Data Rate: Programmable 1–4 MBd (fiber optic transmission speed)
• Transmission Medium: Optical fiber (each channel uses 10 Mb fiber components)
• Driving Current: Programmable: 20 mA, 30 mA, 50 mA; supports channel disabling
• Network Configuration: Supports parallel, series, or mixed connections of multiple NDBU-95 units
• Communication Distance: Complies with ABB DDCS network distance specifications for industrial environments

Electrical & Power

• Supply Voltage: 24 VDC ±10% (industrial auxiliary power)
• Maximum Input Current: Approx. 300 mA
• Isolation: Full galvanic isolation between master and slave channels, and between power and communication circuits
• Status Indicators: Green LED per channel (illuminates when receiving messages)

Mechanical & Environmental

• Dimensions: 264 mm (L) × 94 mm (W) × 41 mm (D)
• Net Weight: Approx. 1 kg
• Mounting: Suitable for cabinet mounting (standard industrial control panel installation)
• Operating Temperature: 0°C to +50°C
• Storage Temperature: -25°C to +70°C
• Relative Humidity: 5%–95% RH, non-condensing
• Ingress Protection: IP20 (for indoor cabinet installation)
• EMC Compliance: Conforms to IEC 61800-7 standards for industrial drive systems
• Certifications: CE marked; manufactured in Finland/SwedenABB

Key Functional Features

Star Topology Communication

• Establishes a 1-to-9 star network, enabling one master controller to communicate with up to 9 slave devices simultaneously.
• Ensures single-point fault isolation: a failure in one slave channel does not disrupt communication on other channels or the entire network.
• Supports peer-to-peer communication between slave devices via the master unit, enhancing network flexibility.

High-Speed & Programmable Operation

• Delivers high-speed data transmission up to 4 MBd, supporting real-time control and monitoring of industrial drive systems.
• Programmable data rate and driving current allow customization for different network lengths, device types, and application requirements.
• Enables channel disabling for flexible network expansion and maintenance without affecting active channels.

Seamless System Integration

• Fully compatible with ABB drive systems (ACS550, ACS800, ACS880, DCS800) and ABB Ability™ automation platformsABB.
• Integrates with ABB PLCs, DCS systems, and DDCS-enabled I/O modules for end-to-end industrial control solutions.
• Supports cascading and parallel configurations of multiple NDBU-95 units to scale network size and connect more slave devices.

Robust Reliability & Diagnostics

• Galvanic isolation protects against electrical interference, ground loops, and voltage surges in industrial environments.
• Per-channel LED indicators provide instant visual feedback on communication status, simplifying installation and troubleshooting.
• Industrial-grade construction ensures stable operation in harsh factory conditions with vibration and electrical noise.

Simplified Network Management

• Reduces cabling complexity by centralizing communication distribution in a star topology.
• Minimizes network configuration time with plug-and-play optical fiber connections.
• Supports easy expansion of industrial drive networks without major system reconfiguration.

Application Scenarios

Industrial Drive Systems

• Multi-Drive Coordination: Connects a central master controller to multiple ABB variable frequency drives (VFDs) in conveyor systems, production lines, and material handling equipment.
• Distributed Motion Control: Enables synchronized control of servo drives and spindle motors in packaging, printing, and textile machinery.
• Drive Network Expansion: Expands DDCS communication networks in large-scale manufacturing facilities with numerous drive units.

Process Automation

• Oil & Gas Industry: Integrates drive control systems for pumps, compressors, and valves in upstream production, midstream pipelines, and downstream refineries.
• Chemical & Pharmaceutical Manufacturing: Supports real-time communication between control systems and drive-controlled reactors, mixers, and processing equipment.
• Water & Wastewater Treatment: Manages communication networks for pump and blower drives in municipal and industrial treatment plants.

Material Handling & Logistics

• Crane & Hoist Systems: Provides reliable communication between master controllers and multiple hoist, trolley, and gantry drives in port terminals, warehouses, and manufacturing plants.
• Elevator & Lift Systems: Enables coordinated control of elevator drive systems in high-rise buildings and industrial facilities.
• Automated Storage & Retrieval Systems (AS/RS): Connects control systems to drive units for stacker cranes and conveyor systems in logistics centers.

Power & Energy

• Power Generation: Integrates drive control networks for boiler feed pumps, fans, and turbine auxiliary systems in thermal and hydro power plants.
• Renewable Energy: Supports communication between control systems and inverter drives in solar and wind power installations.
• Industrial Power Distribution: Manages communication for drive-controlled equipment in power substations and industrial power management systems.

Marine & Offshore

• Shipboard Propulsion & Thrusters: Enables reliable communication for marine drive systems in commercial vessels and offshore platforms.
• Offshore Cranes & Winches: Supports control networks for heavy-lift equipment in offshore oil and gas operations.