Rockwell Automation Allen-Bradley ControlNet 1786 Series, Руководство по установке

Страница: 10 / 74

Publication CNET-IN002A-EN-P - December 2001
1-2 Overview of The ControlNet Coax Media System
Understand the ControlNet
Components
The ControlNet Coax media system is made up of these components. For
information on purchasing these components see the ControlNet
Cable System Component List (publication AG-2.2).
•
nodes
•
taps
•
trunk cable
•
cable connectors
•
terminators
•
segments
•
repeaters
•
links
•
bridges
•
network
node any physical device connecting to the ControlNet cable system
which requires a network address in order to function on the
network — a link may contain a maximum of 99 nodes
this address must be in the range of 1 - 99 and be unique to
that link
repeater
a two-port active physical layer component that reconstructs
and retransmits all traffic it hears on one segment side to
another segment side
segment trunk-cable sections connected via taps with terminators at
each end and with no repeaters
tap the connection between any device and the
ControlNet Coax Media system
terminator
a 75
Ω
resistor mounted in a BNC plug
trunk cable the bus or central part of a cable system
trunk-cable section a length of a cable between any two taps
Term Means
N
R
T