128 Rockwell Automation Publication 2711P-UM006A-EN-P - November 2010
Chapter 7 Terminal Connections
DH+ Network Connections
Use a Belden 9463 twin-axial or equivalent cable, catalog number 1770-CD, to
connect a terminal to a DH+ link.
You can connect a DH+ link in two ways:
• Trunk line/drop line - from the drop line to the connector screw
terminals on the DH+ connectors of the processor.
• Daisy chain - to the connector screw terminals on the DH+ connectors
on the processor.
Follow these guidelines when installing DH+ communication links:
• Do not exceed these cable lengths:
– Trunk line-cable length: 3,048 m (10,000 ft)
– Drop-cable length: 30.4 m (100 ft)
The maximum cable length is determined by the baud rate.
• Do not connect more than 64 stations on a single DH+ link.
Figure 19 - Terminal Connection to DH+ Link
PanelView Plus 6 with
DH-485/DH+ Communication Module
• 82 Ω terminating resistor for
230.4 Kbps
• 150 Ω terminating resistor for
57.6 Kbps and 115.2 Kbps
To Controller
Terminating Resistor
DH+ Port on Communication Module
Clear 1
Shield SH 2
Blue 3
Belden
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