Product Overview

The ABB NDBU-95C, identified by part number 64008366, is a specialized optical branching unit designed to facilitate star topology communication within the Distributed Drives Control System (DDCS) network. This module acts as a central hub, allowing a single master controller, such as an AC 800M or a primary ACS800 drive, to communicate simultaneously with multiple follower drives or I/O devices. By utilizing fiber optic links, the NDBU-95C ensures high-speed data transmission that is entirely immune to electromagnetic interference (EMI) and radio frequency interference (RFI). This branching unit is essential for complex multi-drive systems where synchronized control and rapid signal propagation are required to maintain process stability and precision.

Key Technical Characteristics and Hardware Parameters

The NDBU-95C is engineered for low-latency signal distribution and robust physical integration into industrial control cabinets.

• Model Identification NDBU-95C

• Engineering Code 64008366

• Communication Protocol ABB DDCS (Distributed Drives Control System) via fiber optics

• Interface Capacity 9-channel branching capability (1 Master port to 9 Follower ports)

• Data Rates Supports high-speed optical transmission for real-time drive coordination

• Isolation Type Total galvanic isolation provided by fiber optic medium

• Power Requirements 24V DC (±10%) industrial standard input

• Mounting Configuration Standard DIN-rail mount for efficient space management

• Diagnostic Indicators Integrated LEDs for power status and channel-specific communication activity

• Dimensions 23.5 x 7.5 x 8 cm

• Weight 0.24 kg (Net weight)

• Origin Sweden

Industrial Applications and Operational Use Cases

This branching unit is a vital component for any large-scale automation architecture that relies on high-speed optical fiber for motor control and synchronization.

• ACS800 Multi-Drive Systems Coordinating the speed and torque of several drives in a master-follower configuration, common in paper machine section drives and metal rolling mills.

• Distributed Drive Control Enabling an AC 800M controller to manage up to nine separate drive units through a single optical port, reducing the need for multiple controller communication cards.

• High-Interference Environments Maintaining signal integrity in smelting plants and high-voltage substations where copper-based cabling would be prone to electrical noise.

• Legacy System Maintenance Providing a direct replacement for branching units in existing Advant OCS or ACS800 installations to restore or expand network capacity.

• Marine Propulsion Control Synchronizing multiple thrusters or propulsion motors on vessels where reliable, noise-free communication is critical for maneuvering.