Rockwell Automation 1770 DH,DHII,DH485 CABLE - Manual (Page 90)

Chapter
6
6-1
Constructing a Data Highway II Cable System
In this chapter we explain how to construct a DH II cable system, including
how to:
install the taps
prepare the trunkline cable for installation
attach the trunkline cables and terminators to the tap
install the droplines
Important: Before you begin any procedure explained in this chapter, read
Chapter 5, ‘‘Planning a Data Highway II Cable System” for important
guidelines and precautions to consider when installing your cable network.
The first step in constructing your DH II cable system is to install the taps.
When deciding where to mount the taps, follow these guidelines:
ATTENTION: Mount the tap so that the cap for the dropline jack
can hang from its chain freely without touching a conductive surface.
If the cap for the dropline jack or its chain touches a conductive
surface, the reliability of the link could be significantly reduced.
Make sure the mounting location is convenient for your trunkline
cable routing.
Make sure the mounting location does not cause the trunkline cable
bend-radius to be less than 6 inches (15.2 cm).
Mount the tap at least 2 inches (5.1 cm) from the interface module to make
sure the interface module has sufficient air flow for cooling.
Chapter Overview
Install the Taps