Rockwell Automation 1797-Series ControlNet Ex Media Plannng Installation Manual - Manual (Page 11)

Publication CNET-IN003A-EN-P - January 2006
Overview of the ControlNet Ex Media System 1-3
You can also use the 1797-BCNR FLEX Ex Redundant ControlNet
Barrier Module to interconnect between ControlNet coax and
ControlNet Ex networks. This module provides an alternative to
installing ControlNet Ex fiber repeater hubs.
Figure 1.2 ControlNet Coax barrier system for FLEX Ex
Refer to Install the 1797-BCNR Module on page 3-28 for more
information.
Node
•
Any physical device connecting to the ControlNet Ex or ControlNet media system that
requires a network address to function on the network
•
A network may contain a maximum of 99 nodes
•
This address must be in the range of 1...99 and be unique to that network.
Trunk Terminator
•
A 75
Ω
resistor mounted in a BNC plug
Tap Terminator
•
Terminates a tap drop-cable that has yet to be connected to a node with a “dummy”
node
Barrier
•
Barrier for coax cable provides isolation between safe and hazardous areas
Repeater
•
A device that connects two or more segments together
Term Means
N
D
B
41326
Network
Coax Segment
Trunk Cable
Coax Segment
Safe Area
Hazardous Area
Trunk Cable
T T T B T T T T T
N N N N N N N
1797-BCNR