Yaskawa DeviceNet Option Card CM05x - Manual (Page 10)

Introducing the DeviceNet Network 1-5
DeviceNet has two primary purposes:
• Transport of control-oriented information associated with the control/monitoring of devices
• Transport of configuration parameters which are indirectly related to system control
The list below presents a summary of the Physical/Media specific characteristics of DeviceNet:
• Trunkline-dropline configuration
• Support for up to 64 nodes
• Node removal without severing the network
• Simultaneous support for both network-powered and self-powered devices
• Use of sealed or open-type connectors
• Protection from wiring errors
• Selectable data rates of 125 KBaud, 250 KBaud, and 500 KBaud
• Adjustable power configuration to meet individual application needs
• High current capability (up to 16 Amps per supply)
• Operation with off-the-shelf power supplies
• Power taps that allow the connection of several power supplies from multiple vendors that comply
with DeviceNet standards
The list below summarizes additional communication features provided by DeviceNet:
• Use of Controller Area Network (CAN) technology
• Connection-based model to facilitate application to application communications
• Provisions for the typical request/response oriented network communications
• Provisions for the efficient movement of I/O data
• Fragmentation for moving larger quantities of data
• Duplicate MAC ID detection
The communication platform for the DeviceNet Network is based on the CAN (Controller Area Network)
technology, which was first developed by Bosch for the automotive industry. Some of the benefits of this
protocol are high noise immunity and high temperature operation. Because it uses a serial bus, it reduces signal
wiring complexity and cost while providing high-speed digital control for optimum performance. These benefits
make DeviceNet especially suitable for the industrial automation environment.