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DeviceNet
What is DeviceNet?
DeviceNet is one of the CIP-based field bus systems. In the USA and in Asia it is widely spread in the field of industrial automation. IO-devices and automation unit (SPS) are linked by the field bus standard.
Product OverviewThe field bus system simplifies the management of the field devices connected to it.
ODVA - Development and Conformity
The ODVA (Open DeviceNet Vendor Association) is responsible for maintenance and development of the open standard for field bus systems. The ODVA offers to check the conformity of products.
Topology
Up to 64 participants may be connected to a bus topology in accordance with a field bus. The wiring is split up into main line and stubs. The length of the cables may be up to 500 m. The higher the baud rate, the shorter the transmission distance.
Cable length and Baud Rate
The defined maximum length depends on the type of cable and the desired baud rate. When using a thick DeviceNet cable for the trunkline, the following baud rates are reached:
- 100 m DeviceNet-cable: 500 kbit/s
- 250 m DeviceNet-cable: 250 kbit/s
- 500 m DeviceNet-cable: 125 kbit/s
The sum of stop length is also limited depending on the baud rate.
DeviceNet-IO-Modules
DeviceNet-IO-Modules are used to connect sensors and actuators. There is a differentiation between IO-Modules used for the control cabinet (IP20) and field level (IP67).
Communication
CAN in level 2 of the OSI-Model is used by the field bus standard. This lowers the administrative expense within the network. Before exchanging data, connections have to be set up. Communication is based on already existing connections. There is a distinction between explicit and implicit messages. Explicit messages are used for the configuration of devices or messages that don’t have to be transmitted in real time. Implicit messages are solely used for I/O-data.
The difference level between CAN_H and CAN_L is used for signal transmission. Therefore the transmission is relatively insensitive to electro-magnetic interference. These usually hit both lines at the same time.
In the higher levels of the OSI-Model CIP (Common Industrial Protocol) of the ODVA is used. The producer-consumer-model dictates the communication within CIP. A device (producer) may transmit a message within a single communication process to multiple other devices (consumer).
M12 DeviceNet-Cable
The thick DeviceNet-Cable can be used for the main line as well as for stubs. M12 DeviceNet-Cables are available to purchase in a number of different configurations.
M12 DeviceNet
M12 for DeviceNet is a wide spread type of connector. A-coded 5-pole M12 connectors are supported by the standard.
Termination Resistor
To avoid reflections, each end of the DeviceNet-Cable should be capped off by a bus termination plug. It is recommended to use a M12 DeviceNet-bus-termination-plug.
DeviceNet is a trade mark.
