History
DeviceNet was originally developed by American company Allen-Bradley (now owned by Rockwell Automation). It is layered on top of the CAN (Controller Area Network) technology, developed by Bosch. DeviceNet adapts the technology from ControlNet, which is another industrial protocol developed by Allen-Bradley, and takes advantage of CAN, making it low-cost and robust compared to the traditional RS-485 based protocols.
In order to promote the use of DeviceNet worldwide, Rockwell Automation has adopted the "open" concept and decided to share the technology to third party vendors. Hence, it is now managed by the Open DeviceNet Vendors Association (ODVA), an independent organization located in North America. ODVA maintains specifications of DeviceNet and oversees advances to DeviceNet. In addition, ODVA ensures compliance to DeviceNet standards by providing conformance testing and vendor conformity.
ODVA later decided to bring DeviceNet back to its predecessor's umbrella and collectively call the technology as Common Industrial Protocol or (CIP), which includes the following technologies:
- EtherNet/IP (take note of the capital 'N', and "IP" here means "Industrial Protocol")
- ControlNet
- DeviceNet
- CompoNet
ODVA claims high integrity between the three technologies due to the common protocol adaptation, which makes industrial controls much simpler compared to other technologies.
Read more about this topic: Device Net
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