Rockwell Automation 1770 DH,DHII,DH485 CABLE - Manual (Page 64)

Chapter 3
Constructing a Data Highway or
Data Highway Plus Cable System
3-32
If you choose, you may construct your DH+ network using a daisy chain
configuration, as shown below.
Node Node Node Node
18768
To make daisy chain DH+ connections, connect the twinaxial cable to the
corresponding DH+ connector terminals on the terminal block of both devices
(Figure 3.10).
Figure 3.10
Terminal connections when nodes are daisy chained.
Clear
Drain
Blue
Clear
Drain
Blue
Twinaxial
cable
Terminating
Resistor
Clear
Drain
Blue
Clear
Drain
Blue
Twinaxial
cable
Terminating
Resistor
18769
After connecting all nodes to the DH+ network, you must install a 150 ohm 1/4
watt terminating resistor at each end of the network (Figure 3.10). Some DH+
modules provide an internal resistor option for this purpose. Refer to the manual
for the particular module you are using to see if this option is available.
Construct a Network Using a
Daisy Chain Configuration
(DH+ Only)