Rockwell Automation 1747-SCNR ControlNet Scanner Module Reference Manual - Manual (Page 10)

Publication 1747-RM623D-EN-P - June 2006
Preface P-2
Terminology See these tables for a list of ControlNet network terms and acronyms
used in this manual.
The screen captures shown in this manual are
pictures of the software’s actual screens.
Term Definition
Actual Packet Interval
(API) The measure of how frequently a specific connection produces
its data.
Big-endian A computer architecture in which, within a given multi-byte
numeric representation, the most significant byte has the lowest
address (the word is stored big-end-first - typically Motorola
architecture).
Bit A unit of information consisting of a 1 or a 0. This is the smallest
data unit that can be transmitted.
Class A set of objects all of which represent a similar system
component. A class is a generalization of the object, a template
for defining variables and methods. All objects in a class are
identical in form and behavior, but they may contain different
attribute values.
Client 1. An object that uses the services of another (server)
object to perform a task.
2. An initiator of a message to which a server reacts.
Connection A logical binding between two application objects. These
application objects may be in the same or different devices.
Connection Path The attribute is made up of a byte stream that defines the
application object to which a connection instance applies.
Consume The act of receiving data from a producer.
Consumer A node that is receiving data from a producer.
Device A physical hardware connection to the link. A device may
contain more than one node.
Error A discrepancy between a computed, observed, or measured
value or condition and the specified or theoretically correct value
or condition.
Frame Single data transfer on a link.
Instance The actual physical presentation of an object within a class.
Identifies one of many objects within the same object class.
Link A collection of nodes with unique MAC IDs. Segments
connected by repeaters make up a link; links connected by
routers make up a network.
Little-endian A computer architecture in which, within a given multi-byte
numeric representation, the least significant byte has the lowest
address (the word is stored little-end first - typically Intel
architecture).