Chapter 8: DeviceNet DeviceNet is a low-cost communications link that connects industrial devices to a network and eliminates expensive hard-wiring. The direct connectivity provides improved com- munication between devices as well as important device-level diagnostics not easily available using hard-wired I/O interfaces. 8.1 DeviceNet Specifications We are a member of the Open DeviceNet Vendor Association (ODVA), which is independently run and operated and not directly associated with any one company. The ODVA controls DeviceNet technical specifications with help from Special Interest Groups (SIGs).
Each SIG develops device profiles for one line of product features to ensure interoperability. These pro- files become part of the technical specifications. The DeviceNet Specification is divided into two volumes and defines the following elements: Volume 1 l DeviceNet Communication Protocol and Application (Layer 7 - Application Layer 1 ) l Controller Area Network (CAN) and its use in DeviceNet (Layer 2 - Data Link Layer) l DeviceNet Physical Layer and Media (Layer 1 - Physical Layer) Volume 2 l Device profiles to obtain interoperability and interchangeability among like products DeviceNet incorporates CAN, which defines the syntax or form of the data transmitted.
The DeviceNet application layer defines the semantics or meaning of the data transmitted. For more information on the basics of a DeviceNet cable system, contact ODVA at: ODVA Technology and Training Center 4220 Varsity Drive, Suite A Ann Arbor, MI 48108-5006 USA Phone Number: 1-734-975-8840 Fax Number: 1-734-922-0027 www.odva.org 1 These layers are based on the Open Systems Interconnect (OSI) model. SmartController EX User’s Guide, 11069-000 Rev. F Page 81 of 92