ABSTRACT
DeviceNet is a device-level or low-level industrial open network that communicates between device controller and limit switches, valve manifolds, etc. It is maintained by Open DeviceNet Vendor Association, Inc. (ODVA). It supports 64 nodes with a maximum of 2048 devices. Network topology used is trunk or bus line with drop cables. Devices used are mostly discrete in nature with an analog mix. It has a moderate speed that depends on cable length. DeviceNet supports master-slave, peer-to-peer, and multimaster modes to transfer information on the network. It supports power and signal on the same cable.
It is based on OSI protocol but layers 3–6 are not used. It uses CAN protocol to implement data link and physical layers, while the application layer conforms to common industrial protocol (CIP).
Devices are bus powered with at least 11 V or higher. Data rate depends on trunk distance—the baud rate varying between 125 kbaud and 500 kbaud.
