DeviceNet Communication Protocol


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DeviceNet is a network protocol used in the automation industry to interconnect control devices for data exchange. It utilizes the Common Industrial Protocol over a Controller Area Network media layer and defines an application layer to cover a range of device profiles.

Typical applications include information exchange, safety devices, and large I/O control networks.

Architecture

Technical Overview Define the OSI seven-layer architecture model the physical layer, data link layer and application layer

  1. Network in addition to the signal, but also including power, self-powered support network function (generally used in small devices, such as photo detectors, limit switches or proximity switches, etc.)
  2. Allows three bit rates: 125 Kbit / s, 250 Kbit / s and 500 Kbit / s, the main trunk under different bit rates (trunk) is inversely proportional to the length and bitrate
  3. Flat cable network can be used
  4. Single network can have up to 64 nodes, node address (called MAC ID in DeviceNet) by 0–63. Usually the default address for a new out of the box device is 63
  5. Duplicate node address detection function
  6. Supports master-slave and end-to-end (peer-to-peer) communication architecture, but most of the equipment is operating in the former network architecture
  7. Multiple network allows a single master function
  8. Can be used in high-noise environments