Rockwell Automation 1797-Series ControlNet Ex Media Plannng Installation Manual - Manual (Page 23)

1 Publication CNET-IN003A-EN-P - January 2006
Chapter
2
Plan a ControlNet Ex Media System
What This Chapter Contains Read 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.
For See Page
Determine How Many Taps You Need 2-2
Connect Programming Devices in Safe Areas 2-3
Coax Cable Type 2-3
Fiber Media Type 2-4
Determine Trunk Cable Section Lengths 2-4
Estimate Fiber Media Lengths 2-7
Determine How Many Trunk Terminators You Need 2-7
Determine What Type of Connectors You Need 2-8
Use Redundant Media in a Hazardous Area 2-10
Application Considerations 2-13
Ferrite Beads 2-15
Order Components 2-17
TIP
The ControlNet Ex media system is a ground-isolated
network. To help prevent accidental grounding:
•
Properly select cable, connectors, and
accessories. Local agencies require use of these
items for instrinsically safe system certification.
•
Use the supplied ight-blue intrinsically-safe
insulators and dust caps to cover exposed metal
parts.
•
Any accessories should have a dielectric rating of
greater than 500V.
•
Use good installation techniques.
•
Use blue tape to help prevent metal-to-ground
connections.