DeviceNet has been broadly utilized in many manufacturing facilities all over the globe now for over 2 decades. The main area of DeviceNet’s application is factory automation with I/O-modules, encoders, valves, simple drives and PLC controls. DeviceNet covers the principle part of applications where a medium amount of data with cycle times between 1 millisecond to 500 milliseconds can be exchanged in the network. Along with ControlNet and Ethernet/IP, DeviceNet is one of the 3 open system principles which all utilize the CIP (Common Industrial Protocol) application layers.
History Of DeviceNet
Originally created in the late 1990s by the American enterprise of Allen-Bradley, DeviceNet was then bought up by Rockwell Automation. The DeviceNet framework utilizes parts of Allen-Bradley’s industrial ControlNet while also offering the advantages of the CAN system, allowing for a stable and cost-effective system for traditional RS-485 based protocols. Rockwell Automation then used this technology to expand the international use of DeviceNet while also making it accessible for many third-party suppliers.
These days, DeviceNet is managed and overseen by the independent global industrial automation association of ODVA (North American Open DeviceNet Vendors Association). They not only manage the specifications, but also test the conformity and adherence to their standards, along with any further developments. There’s a high level of integrity between each of these technologies thanks to the common protocol, which essentially streamlines industrial control as opposed to other frameworks and systems.
What Is DeviceNet
DeviceNet is a multi-drop digital network that serves as a communication network connection between I/O devices and industrial controllers, providing a cost-effective network for the distribution and management of simple devices throughout various architectures. It is a network system that utilizes the Bosch-developed CAN (Controller Area Network) bus for its data link layer and most commonly used within industries requiring connection of different devices for computerization and automation tasks.
Utilizing a trunk-line/dropline topology, DeviceNet simplifies installations with DC power available on the network cable, which provides network communications a single connection point for the devices power anywhere up to a maximum of 24 Vdc and 8 Amps. QuickConnect has the additional functionality that allows devices to be exchanged at any time while the network is running. Additionally, DeviceNet supports both explicit messaging and I/O for configuration and control via a single point of connection, while also operating in a distributed control or master-slave architecture that uses peer-to-peer communication.
DeviceNet uses CIP (Common Industrial Protocol) for its upper layers, while also following the OSI (Open Systems Interconnection) model that defines the implementation of network protocols in a framework of seven layers of physical, network, data link, transport, session, application, and presentation. From physical implementation all the way through to the (UI) user interface or application layer, network systems which follow this model provide a complete and comprehensive suite of network functionality.
Most often used in Asia and the USA, DeviceNet is typically necessary for information exchanges in security hardware, safety equipment, and larger sized in/output control units. It is also the same network technology that is utilized for communication between smart devices in automotive vehicles. CIP services a variety of automation applications for manufacturing industries which encompasses energy, control, safety, motion, synchronization, information, as well as network management. A truly media-independent protocol, CIP is supported by vendors everywhere while providing communication architecture that is unified throughout manufacturing enterprises.
How DeviceNet Works
A connection-based network, DeviceNet is composed of connections which allows for explicit and implicit messages to be sent. Explicit messages are generally data packets which are sent out with an answer expected from another device without any time limits. Implicit messages by contrast are communicated over the network in real-time and are also time-sensitive. Before an understood correspondence can be started, an unequivocal message association must exist. Once the association has been made, it can be utilized to send information to the system’s comparing hub.
The benefits of using DeviceNet includes widespread acceptance, low cost, high reliability, power availability on the network, and efficient use of network bandwidth. There are also some disadvantages of DeviceNet such as limited bandwidth and message size, as well as a maximum length of cables. DeviceNet issues are also generally quite easy to fix, as between 90% to 95% of all problems are either a cabling issue, or the incorrect EDS file has been registered.
DeviceNet supports peer-to-peer communication and Master / Slave (Group 2 only) on the same single physical network. Allowing up to 64 nodes, DeviceNet can consist of Multiple Masters which can then control their own unique Slaves, or 1 Master and anywhere up to 63 slaves. When looking at the overall advantages of DeviceNet, it can be a great network for many industrial applications. If you currently use DeviceNet or have any queries about utilizing it in your business, contact the experts at Buchannan Electric to discuss it more today.