Industrial Networking
 

DeviceNet Introduction
 

DeviceNet™ Unplugged
A View “Under the Hood” for End Users
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Figure 1 - CAN and the OSI Model
Figure 1 - CAN and the OSI Model

Allen-Bradley (Rockwell Automation) created DeviceNet as an application layer protocol on top of CAN in the 1990’s. AB selected CAN as the DeviceNet Physical Layer for a number of reasons including:

  • An extremely robust physical layer
  • Open Technology
  • Small processor footprint (RAM, ROM Requirements)
  • Inexpensive physical components with multiple sources
One of the most extraordinary features of CAN (and DeviceNet) is bitwise arbitration. Bitwise Arbitration is the process that CAN uses to prioritize messages without losing any network bandwidth. On a CAN network “zero” bits dominate “one” bits. As a device transmits a message it listens to the bits on the network. If a device transmits a one and hears a zero, it knows that a higher priority message is being transmitted and it discontinues transmitting. The node with the higher priority message hears the bits it is transmitting and never knows it conflicted with a lower priority message. The message sequence on the network is preserved.

Solutions:


» Altivar 31 DeviceNet Slave
» Instant DeviceNet chip
» Instant DeviceNet Enabler
» DeviceNet on a Chip
» Custom Solutions
» ASCII to DeviceNet Gateway
» DeviceNet Valve Control
» DeviceNet Embedded Gateway
» DeviceNet Serial Gateway
» DeviceNet NetBurner
» DeviceNet Flow Control
» DeviceNet Slave Source Code
» DeviceNet Master
» NetSilicon DeviceNet Master
» NetSilicon DeviceNet Slave

  
 


More Information
     
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My Product
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  » I want this file in PDF Format
  » I need to Find a DeviceNet Product
     
For Your Immediate Needs Call:

John Rinaldi
Networking Project Manager
1-800-249-1612
1-414-453-5100
     
RTA, Inc. - The Industrial Networking Home for DeviceNet, EtherNet/IP, Ethernet Drive,
Modbus, PROFInet CBA, PROFInet IO and other networks.

(c) 2007 Real Time Automation, Inc. - Networking in 30 Days or Less

www.industrialethernetsolutions.com
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By John Rinaldi
Real Time Automation, Inc.
2825 N. Mayfair Rd. Suite 11
Wauwatosa WI 53222
(414) 453-5100 (V)
(414) 453-5125 (F)
www.rtaautomation.com
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