Rockwell Automation 1770 DH,DHII,DH485 CABLE - Manual (Page 77)

Chapter
5
5-1
Planning a Data Highway II Cable System
This DH II cable system gives you flexibility to design a communication
network that is tailored to your particular needs. To take full advantage of this
flexibility, you should spend sufficient time planning how to install your cable
system before assembling any of your hardware.
Important: This chapter provides important specifications, guidelines and
precautions that you need to know before you construct your DH II network.
Read this chapter carefully before beginning any construction of your
cable system.
After reading this chapter, you will be ready to begin constructing your DH II
cable system. This chapter provides information to help you plan a DH II cable
system, including:
components of a DH II network
necessary tools
guidelines for determining cable length
selecting the number of taps
harmful environmental factors
After reading this chapter, consult schematic and engineering drawings of your
plant facility for specific information concerning the best location for installing
your cable network.
In this section we explain the functions and specifications of the following
components of a DH II network:
trunkline
droplines and taps
terminators
Chapter Overview
Components of a DH II
Network