Specifications

Glossary
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EIO0000000051 6/2010
CI
This abbreviation stands for command interface.
CiA
CiA (CAN in Automation) is a non-profit group of manufacturers and users dedicated
to developing and supporting CAN-based higher layer protocols.
CIP
Common Industrial Protocol. Networks that include CIP in the application layer can
communicate seamlessly with other CIP-based networks. For example, the
implementation of CIP in the application layer of an Ethernet TCP/IP network
creates an EtherNet/IP environment. Similarly, CIP in the application layer of a CAN
network creates a DeviceNet environment. Devices on an EtherNet/IP network can
therefore communicate with devices on a DeviceNet network via CIP bridges or
routers.
COB
A COB (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.
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.
CSMA/CS
carrier sense multiple access/collision detection. CSMA/CS is a MAC protocol that
networks use to manage transmissions. The absence of a carrier (transmission
signal) indicates that a network channel is idle. Multiple nodes may try to
simultaneously transmit on the channel, which creates a collision of signals. Each
node detects the collision and immediately terminates transmission. Messages from
each node are retransmitted at random intervals until the frames are successfully
transmitted.