Rockwell Automation 1770 DH,DHII,DH485 CABLE - Manual (Page 28)

Planning a Data Highway or Data Highway Plus
Cable System
Chapter 2
2-12
You need one 1770-XG connector kit for each node you want to link to the
DH network.
The 1770-XG connector kit may be used on a DH or DH+ network.
For information on installing a 1770-XG connector kit, refer to Chapter 3.
If you prefer not to use station connectors and droplines on your DH+
network, you may interconnect nodes in a daisy chain fashion. For more
information on daisy chaining, refer to Chapter 3.
To install a DH or DH+ cable system, you need the following tools:
rosin core solder
multimeter with needle probes
soldering pencil with fine-point tip (for installing 1770-XG connectors)
wire cutters
wire strippers
heat gun
pair of small needlenose pliers, preferably with smooth jaws
small vice, preferably with smooth jaws
The trunkline on your network is divided into several segments. The cable
length of the trunkline is equal to the total cable length of the trunkline
segments.
Important: When determining the cable length of trunkline segments, be
sure to measure the actual cable path as it is routed in your network. Make
sure to consider vertical dimensions as well as horizontal dimensions. You
should always calculate the three-dimensional path distance when
determining cable lengths.
How you configure your DH or DH+ network determines the lengths of all
trunkline segments and droplines.
Daisy Chaining (DH+ only)
Necessary Tools
Determining Cable Length