Installation guide

Network Infrastructure for EtherNet/IP™
D-3
Appendix D Glossary of Terms
Term Definition
network. This value distinguishes a node among all other nodes
on the same link. The format is network specific.
node A collection of objects that communicate over a subnet and
arbitrate using a single MAC ID. A physical device may contain
one or more nodes.
node address See network address.
object (1) An abstract representation of a particular component within a
product. Objects can be composed of any or all of the following
components:
a) data (information which changes with time);
b) configuration (parameters for behavior);
c) methods (things that can be done using data and
configuration).
(2) A collection of related data (in the form of variables) and
methods (procedures) for operating on that data that have clearly
defined interface and behavior.
object-specific service A service defined by a particular object class to perform a
required function that is not performed by a common service.
An object specific service is unique to the object class that
defines it.
octet An octet is 8 bits that indicate no particular data type.
off-link connection A connection between two or more devices that are on
physically different networks.
originator A node (client) that requests the creation of a connection to a
target.
ping The sequence of messages that coordinates time between
consumers and producers
ping request Request for the acknowledge of the reception of a message.
ping response Response to a ping request.
point-to-point connection A connection that exists between two nodes only. Connections
can be either point-to-point or multicast.
port A CIP port is the abstraction for a physical network connection
to a CIP device. A CIP device has one port for each network
connection. Note: network specific definitions may include
additional definitions of this term within the context of the
network.
produce Act of sending data to a consumer.
producer A node that is responsible for transmitting data.
redundant media A system using more than one medium to help prevent
communication failures.
Requested Packet Interval (RPI) The measure of how frequently the originating application
requires the transmission of data from the target application.