Rockwell Automation Allen-Bradley ControlNet 1786 Series, Installation Instructions Manual

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1 Publication CNET-IN002A-EN-P - December 2001
Chapter
2
Plan a ControlNet Coax Media System
What’s in This Chapter
Use this chapter to determine your network requirements.
After reading this chapter, consult engineering drawings of your
facility for specific information concerning the best location for
installing your network.
Determine the Number of
Taps You Need
The number of taps you need depends on the number of devices you
want to connect to the network. You need a tap for each node and
repeater on a segment.
If you plan to add nodes at a later date, you should order and install
the cable and connectors for these additional nodes when you install
For information about this topic: See page:
Determine the Number of Taps You Need 2-1
Connect Program Devices 2-3
Determine What Type of Cable You Need 2-4
Determine Trunk Cable Section Lengths 2-5
Determine How Many Terminators You
Need 2-7
Determine if You Need Repeaters 2-7
Determine What Type of Connectors You
Need 2-10
Using Redundant Media (Optional) 2-11
Using IP67 Media 2-15
Application Considerations 2-15
Order Components 2-18
IMPORTANT
The ControlNet cable system is a ground-isolated
Coaxial network. Proper selection of cable,
connectors, accessories, and installation techniques
is necessary to make sure it is not accidentally
grounded.