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Glossary
Term Definition
assembly Internal data in a device gathered as one group to be accessed externally.
bit-strobe connection One of the connection types for I/O communications in DeviceNet standard
communications. For a bit-strobe connection, the Master broadcasts a mes-
sage and the Slaves that receive the message return input data. Communica-
tions are performed on a communication cycle, just as for poll connections, but
effective communications are possible for Input Slaves.
Busoff Status that occurs when the error rate on the DeviceNet network is extremely
high over a communications cable. An error is detected when the internal error
counter in a device exceeds a certain threshold value. Countermeasures
based on error corrective actions are required when a busoff occurs.
CAN An acronym for Controller Area Network.
CAN is a highly reliable yet low-cost communications protocol standardized by
the ISO.
CIP An acronym for Common Industrial Protocol.
CIP is an open multivender communications protocol. It enables communica-
tions between various devices without restrictions due to network types or dif-
ferences in devices. DeviceNet and EtherNet/IP and CIP networks.
CIP safety A safety extension of the CIP that supports IEC 61508 SIL3 and EN 954-1
Safety Category 4.
A safety layer is added to the CIP application layer so that traditional CIP com-
munications and CIP safety communication can coexist simultaneously without
interfering with each other, achieving highly reliable safety communications.
DeviceNet Safety and EtherNet/IP Safety are CIP Safety-compliant networks
based on DeviceNet and EtherNet/IP Safety.
configuration Using the Network Configurator to built a network and set devices.
configuration data The device setting parameters. Configuration data is set in devices using the
Network Configurator. There are parameters related to safety functions and
parameter not related to safety functions. Parameters related to safety func-
tions are protected by a safety signature.
configuration lock Indicates that device operation has been checked by user testing and that the
parameters that have been set related to safety functions have been verified.
connection A logical communications path used to communicate between devices.
connection type The connection types are as follows depending on the communications
method.
DeviceNet Standard Communications
• Poll connection
• Bit-strobe connection
• COS connection
• Cyclic connection
• Explicit message connection
DeviceNet Safety Communications
• Single-cast connection
• Double-cast connection
COS connection An acronym for Change of State. One of the connection types for I/O communi-
cations in DeviceNet standard communications.
For this connection type, data is sent after a set period of time elapses, just as
for a cyclic connection, but data can also be sent when data changes or a data
send request is received from the application. Conditions depend on the
device. A COS connection enables effective communications for changes in
data or requests from applications without being dependent on the communi-
cations cycle of the Master. COS connections cannot be used at the same time
as cyclic connections.
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