Rockwell Automation 1770 DH,DHII,DH485 CABLE - Manual (Page 103)

Planning a DHĆ485 Cable System
Chapter 8
8-2
In this section we explain the functions and specifications of the following
components of a DH-485 network:
trunkline
link couplers
Use Figure 8.1 for reference when reading about these components.
Figure 8.1
An example DHĆ485 network.
1747-C11 Cable
1747-C11 Cable
1747-C11 Cable
Link
Coupler
1747-AIC
Link
Coupler
1747-AIC
Link
Coupler
1747-AIC
Communication
Cable
Belden #9842
Personal Computer
with 1784-KR Installed
SLC 500
Controller
SLC 500
Controller
SLC 500
Controller
17680
Trunkline
Nodes on the trunkline are interconnected in a daisy chain fashion. The length
of your trunkline depends upon the location of the nodes in your network,
however, the maximum length is 4,000 feet (1220 meters).
Your cable system has the capability of interconnecting up to 32 devices.
Components of a DHĆ485
Network