10-10
Glossary Section 8-4
Additional Informa-
tion for DeviceNet
8-4 Glossary
The following table provides a list of commonly used DeviceNet terms.
Term Explanation
Bus OFF Indicates that the error rate in the network is extremely high. Errors are detected when a
fixed threshold is exceeded by the internal error counter. (the internal error counter is
cleared when the Master Unit is started or restarted.)
CAN CAN is short for Controller Area Network. It is a communications protocol developed as a
LAN for use in automobiles. DeviceNet employs CAN technology.
Configurator A device for setting the system settings. The Configurator can read ID information, read
and write parameters, and display the network configuration.
OMRON’s DeviceNet Configurator is designed for use with an OMRON Master Unit.
Consumed Connection Size Indicates the data size (byte length) received via the connection.
ODVA ODVA is short for Open DeviceNet Vendor Association, Inc. It is a non-profit organization
formed by machine vendors with the aim to administer and popularize the DeviceNet
specification.
Produced Connection Size Indicates the data size (byte length) sent via the connection.
Connection This is a logical communication channel for facilitating communications between nodes.
Communications are maintained and managed between the master and slaves.
Device Profile Standardizes the configuration and behavior (the smallest data configuration and opera-
tion that must be supported by the device) of devices of the same type (equipment, etc.).
Provides mutual exchangeability between devices of the same type. Also known as a
device model. Devices for which device profiles are currently being investigated include
sensors, valves, display units, and encoders.
Master/Slave A node can be either a master, which collects and distributes data, or a slave, which out-
puts and inputs data according to the instructions received from the master. OMRON’s
DeviceNet products are already provided with either master or slave functions in a pre-
defined master/slave connection set.
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