ABB NDBU-95C 64008366 DDCS Branching Unit

The ABB NDBU-95C (Product ID: 64008366) is a star connection branching unit designed for industrial drive communication networks utilizing the DDCS (Distributed Drives Communication System) protocol. It functions as a 9-channel branching component to enable reliable optical link communication and network expansion within multi-drive control architectures, such as the ACS800 and ACS880 series drive systems.

Features

• 9-Channel Architecture: Equipped with 9 optical channels (CH0 to CH8) plus a master channel (MSTR) connection to handle multi-point data distribution.
• High-Speed Optical Components: Features 10 MBd optical transmitters and receivers across all master and branch channels.
• Flexible Media Support: Compatible with Plastic Optical Fibre (POF) and Hard Clad Silica (HCS) cabling systems depending on transmission distance requirements.
• Configurable Transmission Current: Supports adjustable transmitter power settings (Short, Medium, Long) via board configuration to match optical fiber link length.
• Hardware Address Selection: Integrates 8-position DIP switch (S1) enabling hardware-level node address definition within a structured star hierarchy.

Applications

• ACS800 Multi-Drive Systems: Used as a key network distribution and spare part component for ACS800-107 configuration variants.
• ACS880 Multi-Drive Platforms: Integrates within complex control topologies involving ACS880-207 drive architectures.
• DCS Thyristor Power Converters: Coordinates optical signal distribution when interfacing with DC drive power converter segments.
• DriveWindow Communication Networks: Acts as the central hardware node linking host commissioning computers running DriveWindow software to downstream drive controllers.

Technical Specifications

Installation Guidelines

• Address Hierarchy Configuration: Prior to network operation, set the unit node address via the onboard DIP switch S1. The branching unit physically positioned closest to the control PC must be configured with the highest address number within the allowed address range of 124 to 76.
• Optical Link Setting Rules: Maintain uniform component speeds across the physical link network. Mixing 5 MBd and 10 MBd optical modules on the same transmission loop is strictly prohibited to prevent data loss or signal degradation.
• Unused Channel Management: To maximize internal resource efficiency and prevent layout interference, select the DISABLED software/hardware jumper option for all unused optical channels.
• Fiber Optic Length Boundaries:
  • Plastic Optical Fibre (POF): Max 30 m for ACS drives; max 20 m for DCS drive structures.
  • Hard Clad Silica (HCS): Max 200 m for ACS configurations; max 50 m for DCS installations.