ABB NDBU-85C
ABB NDBU-85C
ABB NDBU-85C
ABB NDBU-85C
ABB NDBU-85C

ABB NDBU-85C | DeviceNet Bus Interface Module for AC500 PLC

  • Brand: ABB
  • Model: NDBU-85C
  • Product Type: DeviceNet Communication Module
  • Series: Procontic CP600/AC500 Communication Modules
  • Core Function: Provides DeviceNet protocol interface for ABB PLCs to connect with DeviceNet-enabled field devices (e.g., drives, remote I/O), enabling bidirectional I/O data exchange and device configuration.
  • Key Specs: Supports DeviceNet CIP protocol, 125kbps–500kbps baud rate, up to 64 nodes per network, 24V DC power supply.
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Part number: ABB NDBU-85C
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Description

NDBU-85C: Product Overview
This component is a DeviceNet communication module within ABB’s Procontic CP600/AC500 series, designed for industrial automation systems requiring fieldbus integration with DeviceNet-enabled devices. In a PLC architecture, it functions as a network interface, positioned in the PLC controller’s communication slot to bridge the controller with DeviceNet networks (e.g., remote I/O stations, variable frequency drives, smart sensors). Its role is to manage deterministic data exchange—transmitting control commands from the PLC to field devices and relaying device status/feedback—while adhering to DeviceNet protocol standards (CIP, ODVA-compliant) for real-time process communication.
The core functionality involves encoding/decoding DeviceNet signals, handling I/O data packets (explicit/implicit messaging), and managing node addressing (up to 64 devices per network). It supports baud rates from 125kbps to 500kbps (configurable for cable length and noise immunity), with data capacity of 8 bytes input/output per node (standard) or 64 bytes (extended). The module includes built-in diagnostics for bus errors (e.g., CRC faults, node timeouts) and device status monitoring, aiding in troubleshooting. It also enables remote parameter adjustment of field devices (e.g., drive setpoints, sensor calibration) via explicit messaging.
It belongs to the Procontic CP600/AC500 Communication Modules family, optimized for modularity, compatibility, and integration with ABB’s automation ecosystem. The platform’s benefits include standardized mounting to PLC chassis, seamless configuration via ABB’s Control Builder M software, and adherence to ODVA DeviceNet standards—ensuring interoperability with third-party DeviceNet devices. This reduces system integration time and supports phased upgrades of legacy installations.

ABB NDBU-85C

ABB NDBU-85C

NDBU-85C: Technical Specifications
  • Model Number: NDBU-85C
  • Manufacturer: ABB
  • Product Type: DeviceNet Communication Module
  • Protocol Support: DeviceNet (CIP, ODVA-compliant), supports master/slave modes
  • Baud Rate: 125kbps, 250kbps, 500kbps (configurable)
  • Number of Nodes: Up to 64 devices per DeviceNet network segment
  • Data Capacity: 8 bytes I/O per node (standard), 64 bytes (extended); 100 explicit messages/sec
  • Power Supply: 24V DC (±10% tolerance, drawn from PLC backplane)
  • Operating Temperature: -25°C to +55°C
  • Storage Temperature: -40°C to +70°C
  • Electrical Isolation: 500Vrms (channel-to-bus, channel-to-ground)
  • Connector Type: 5-pin removable terminal block (for DeviceNet trunkline/drop lines)
  • Dimensions: 30mm x 100mm x 120mm (WxHxD, fits PLC communication slot)
  • Weight: 0.16kg
Core Features & Customer Value​
The module’s design prioritizes protocol compliance, network scalability, and operational reliability. DeviceNet CIP support ensures compatibility with ABB drives (e.g., ACS355) and third-party devices (e.g., sensors, actuators), eliminating the need for protocol converters and reducing component count. The 500kbps maximum baud rate enables fast data transfer for high-speed applications (e.g., motion control), while lower baud rates (125kbps) accommodate long cable runs (up to 500 meters) in large facilities.
Up to 64 nodes per segment simplifies network topology for medium-sized systems (e.g., a packaging line with 40 sensors and 20 actuators), minimizing the need for additional gateways or segments. The 500Vrms isolation prevents ground loops and transient voltage spikes from corrupting data—critical in environments with heavy machinery (e.g., metal forming presses), where electromagnetic interference is common.
Integration with Control Builder M software streamlines configuration: engineers define node addresses, I/O mapping, and baud rates via a graphical interface, with automatic generation of diagnostic tags. This consistency with other Procontic/AC500 modules reduces training time and minimizes configuration errors. Built-in diagnostics (e.g., node offline alerts, error frame counters) provide actionable insights, allowing maintenance teams to address network issues before they disrupt production.

ABB NDBU-85C

ABB NDBU-85C

Typical Applications​
In an automotive assembly line, the module connects an ABB AC500 PLC to 30 DeviceNet remote I/O stations (monitoring part presence sensors) and 20 ACS355 VFDs (controlling conveyor motors). The 500kbps baud rate ensures real-time synchronization of conveyor speeds, while diagnostics alert operators to a failed I/O station (node timeout), minimizing line stoppages.
At a material handling facility, it interfaces the PLC with DeviceNet-enabled barcode scanners and motorized rollers. The 64-node capacity covers all field devices in a single segment, and the -25°C to +55°C operating range suits warehouse control panels. I/O messages transmit roller speed commands, while explicit messages adjust scanner sensitivity during lighting changes.
In a woodworking machine center, the module links the PLC to DeviceNet servo drives (positioning saw blades) and laser sensors (edge detection). Isolation protects against EMI from spindle motors, while configurable I/O ensures sub-millisecond response for precise cutting paths.

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