Rockwell Automation 1747-SCNR ControlNet Scanner Module Reference Manual - Manual (Page 11)

Publication 1747-RM623D-EN-P - June 2006
Preface P-3
Multicast Connection A connection where one node produces data and multiple nodes
consume that exact same data. Connections can be either
point-to-point or multicast.
Network A series of nodes connected by some type of communication
medium. The connection paths between any pair of nodes can
include repeaters, routers, and gateways.
Network Access Port
(NAP) Physical Layer variant that lets a temporary node to be
connected to the link by connection to the NAP of a permanent
node.
Network Address or
Node Address A node’s address on the link (also called MAC ID).
Network Status
Indicators Indicators on a node displaying the status of the Physical and
Data Link Layers.
Network Update Interval
(NUI) A single occurrence of the ControlNet Network Update Time
(NUT).
Network Update Time
(NUT) Repetitive time interval in which data can be sent on the link.
Node A connection to a link that requires a single MAC ID.
Object 1. An abstract representation of a computer’s capabilities.
Objects can be composed of any or all of the following
components: data (information which changes with time)
configuration (parameters for behavior) 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.
Originator The client responsible for establishing a connection path to the
target.
Point to Point
Connection A connection that exists between two nodes only. Connections
can be either point-to-point or multicast.
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.
Scanner Configuration
Tool (SCT) Software tool that lets you to configure scheduled connections,
map data for these connections, and monitor the status for the
configured connections.
Scheduled Data transfers that occur in a deterministic and repeatable
manner on predefined NUTs.
Server An object which provides services to another (client) object.
Service Operation or function that an object performs upon request from
another object.
Target The end-node to which a connection is established.
Unscheduled Data transfers that use the remaining time in the NUT after the
scheduled transfers have been completed.