Information about the Different Field Busses

DeviceNet^TM was developed by Rockwell Automation and the ODVA as an open field bus standard, based on the CAN protocol and is standardized in the European standard EN 50325. Specification and maintenance of the DeviceNet standard is regulated by the ODVA.

DeviceNet^TM Application Layer-CIP Protocol:

The CIP (Common Industrial Protocol) forms the application layer for DeviceNet^TM. The CIP defines the exchange of I/O data in realtime via I/O messages (I/O messaging or implicit messaging), as well as the exchange of data required for configuration, diagnosis and management via explicit messages (explicit messaging). The communication between two devices always takes place according to a connection-oriented communication model, either via a point-to-point or a multicast-V1 connection. This allows both master/slave and multi-master systems to be realized. Data are known as objects and are logged in the object directory of each device.

You can get further information on DeviceNet^TM from the Open DeviceNet Vendor Association (ODVA):

http://www.odva.org
mailto:odva@odva.org

CANopen was developed by the CiA and is standardized since at the end of 2002 in the European standard EN 50325-4.
As communication method CANopen uses the layers 1 and 2 of the CAN standard which was developed originally for the use in road vehicles (ISO 11898-2).

CANopen - Communication Profile:

The CANopen communication profile (defined in CiA DS-301) regulates the devices data exchange. Here real time data (e.g. position value) and parameter data (e.g. code sequence) will be differentiated. To the data types, which are different from the character, CANopen assigns respectively suitable communication elements.