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Glossary
Busoff A Busoff error occurs when there is an unacceptably high error rate on the
communications bus. This error is detected when the internal error counter ex-
ceeds a specified value. (The error counter is cleared whenever the Master
Unit is started or reset.)
CAN Controller Area Network. A communications protocol for a LAN developed for
mounting in automobiles. The DeviceNet uses CAN technology.
configurator A device used to make system settings, read IDs, read/write parameters, read
the network configuration, etc. OMRON provides a DeviceNet Configurator for
OMRON Master Units.
consumed connection size The size in bytes of the data received through a connection.
ODVA Open DeviceNet Vendor Association. A non-profit vendor association respon-
sible for spreading DeviceNet.
produced connection size The size in bytes of the data sent through a connection.
connection A logical communications channel created to communicate between two
nodes. Connections are established and maintained between masters and
slaves.
device profile A description of the structure and behavior of a device giving the minimum data
configurations and operations that the device must support. Device profiles en-
able common device models, and are also called device models. Device pro-
files are being studied for sensors, valves, displays, encoders, and other
devices.
master A node that controls the collection and distribution of data. With the DeviceNet,
the predefined master/slave connection set defines the functions provided by
all masters.
slave A node that provides data in response to requests from masters. With the De-
viceNet, the predefined master/slave connection set defines the functions pro-
vided by all slaves.
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