Glossary, Defi – Rockwell Automation 25-COMM-D PowerFlex 525 DeviceNet Adapter User Manual
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Rockwell Automation Publication 520COM-UM002A-EN-E - April 2013
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Glossary
The following terms and abbreviations are used throughout this manual.For
definitions of terms not listed here, see the Allen-Bradley Industrial Automation
Glossary, publication
Adapter
Devices such as drives, controllers, and computers usually require an adapter to
provide a communication interface between them and a network such as
DeviceNet. An adapter reads data on the network and transmits it to the
connected device. It also reads data in the device and transmits it to the network.
The 25-COMM-D DeviceNet adapter connects PowerFlex 525 drives to a
DeviceNet network. Adapters are sometimes also called ‘cards’, ‘embedded
communication options’, ‘modules’, and ‘peripherals’.
ADR (Automatic Device
Replacement)
A means for replacing a malfunctioning device with a new unit, and having the
device configuration data set automatically. The DeviceNet scanner is set up for
ADR using RSNetWorx for DeviceNet software. The scanner uploads and stores
a device’s configuration. Upon replacing a malfunctioning device with a new unit
(node 63), the scanner automatically downloads the configuration data and sets
the node address.
Bridge
A network device that can route messages from one network to another. A bridge
also refers to a communications module in a ControlLogix or CompactLogix
controller that connects the controller to a network. See also Scanner.
Bus Off
A bus off condition occurs when an abnormal rate of errors is detected on the
Control Area Network (CAN) bus in a device. The bus-off device cannot receive
or transmit messages on the network. This condition is often caused by
corruption of the network data signals due to noise or data rate mismatch.
CAN (Controller Area Network)
CAN is a serial bus protocol on which DPI is based.
Change of State (COS) I/O Data
Exchange
A device that is configured for Change of State I/O data exchange transmits data
at a specified interval if its data remains unchanged. If its data changes, the device
immediately transmits the change. This type of exchange can reduce network
traffic and save resources since unchanged data does not need to be transmitted
or processed.
CIP (Common Industrial Protocol)
CIP is the transport and application layer protocol used for messaging over
EtherNet/IP, ControlNet, and DeviceNet networks. The protocol is used for
implicit messaging (real-time I/O) and explicit messaging (configuration, data
collection, and diagnostics).