Schneider Electric 890USE17700 - Manual (Page 175)

Glossary
890USE17700 April 2004 175
CAN controller area network. The CAN protocol (ISO 11898) for serial bus networks is
designed for the interconnection of smart devices (from multiple manufacturers) in
smart systems for real-time industrial applications. CAN multi-master systems
ensure high data integrity through the implementation of broadcast messaging and
advanced error mechanisms. Originally developed for use in automobiles, CAN is
now used in a variety of industrial automation control environments.
CANopen
protocol An open industry standard protocol used on the internal communication bus. The
protocol allows the connection of any standard CANopen device to the island bus.
CI command interface.
CiA CAN in Automation. CiA is a non-profit group of manufacturers and users dedicated
to developing and supporting CAN-based higher layer protocols.
COB communication object. A communication object is a unit of transportation (a
message) in a CAN-based network. Communication objects indicate a particular
functionality in a device. They are specified in the CANopen communication profile.
COMS island bus scanner.
configuration The arrangement and interconnection of hardware components within a system and
the hardware and software selections that determine the operating characteristics of
the system.
CRC cyclic redundancy check. Messages that implement this error checking mechanism
have a CRC field that is calculated by the transmitter according to the message’s
content. Receiving nodes recalculate the field. Disagreement in the two codes
indicates a difference between the transmitted message and the one received.
DeviceNet
protocol DeviceNet is a low-level, connection-based network that is based on CAN, a serial
bus system without a defined application layer. DeviceNet, therefore, defines a layer
for the industrial application of CAN.
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