Extend-a-Bus Series Exceed the Geographical Limits of CAN-Based Networks

Extend-a-Bus Series

Product Support

  Data Sheet

  User Manual


Drivers, APIs and utility programs can be obtained by contacting Contemporary Controls.

Regulatory Compliance

  North American Safety Standards Certificate, (UL 508), (CSA-C22.2 No. 142)

  Declaration of Conformity

*Note: These are Legacy Products; some components may contain lead.

Product Overview

  • Extends the length of DeviceNet™ networks up to 6 km
  • Fully DeviceNet compliant
  • Fiber optic or coaxial cabling
  • Star, bus or distributed-star topology
  • Variable data rates up to 500 kbps
  • Low-voltage AC- or DC-powered
  • Panel-mount or DIN-rail mount

Product Details

The EXTEND-A-BUS Series can extend DeviceNet up to six kilometers-linking individual DeviceNet subnets together into a single larger network.

Each EXTEND-A-BUS unit creates a DeviceNet subnet and at least two units are needed to link subnets together. The data rate on each subnet can differ from those of other subnets. DeviceNet identifiers or MAC IDs cannot be duplicated on any of the subnets. Each EXTEND-A-BUS pair is best viewed as an extension cord. A unit does not consume a permanent MAC ID, therefore it is transparent to the network.

The backbone side of the EXTEND-A-BUS must adhere to standard ARCNET cabling rules. Companion AI ARCNET active hubs are available for extending the backbone cabling. Hubs are cascaded to achieve the maximum distance: up to 6 km when using coaxial cabling and ten active hubs or up to 4.8 km when using a fiber optic backbone and two active hubs.

Ordering Information

Model Description    
EB/DNET-CXB EXTEND-A-BUS for DeviceNet with coaxial bus backbone Contact Us
EB/DNET-FOG EXTEND-A-BUS for DeviceNet with fiber optic backbone Contact Us


Model Description    
AI-XFMR Wall-mount plug-in transformer 120 VAC (nom) input/24 VAC (nom) output (details...) $39
AI-XFMR-E Wall-mount plug-in transformer 230 VAC (nom) input/24 VAC (nom) output (details...) $55
BNC-TER 93 ohm BNC terminator $8
BNC-T BNC "T" connector $8