Rockwell Automation 1785-L20C_L40C, D17856.5.14 ControlNet PLC-5 Programmable Controllers User Manual - Manual (Page 22)

Chapter 1
Installing Your ControlNet PLCĆ5 Processor
1-14
Use 1770-CD cable to connect the processor to a DH+ link.
Follow these guidelines while installing DH+ communication links:
do not exceed these cable lengths:
- trunk-cable length—3,048 m (approximately 10,000 cable-ft)
- drop-cable length—30.4 m (approximately 100 cable-ft)
do not connect more than 64 stations on a single DH+ link
19339
82 W or 150 W resistor
Clear
Shield
Blue
Clear
Shield
Blue
82Ω or 150 W resistor
Use the 3Ćpin connector on the processor to
connect a DH+ link. The connector's port must be
configured to support a DH+ communication link.
You can install a DH+ link two ways:
• trunk cable/drop cableĊfrom the drop cable to
the connector screw terminals on the DH+
connectors of the processor
• daisy chainĊto the connector screw terminals
on the DH+ connectors of the processor
To make connections:
1. Connect the signal conductor with clear
insulation to the 3Ćpin connector terminal 1
at each end of each cable segment.
2. Connect the shield drain wire to the center
terminal of the 3Ćpin connector at both ends
of each cable segment.
3. Connect the signal conductor with blue
insulation to the 3Ćpin connector terminal 2
at each end of each cable segment.
PLCĆ5/40C
Processor
PLCĆ5/20C
Processor
More
For more information, see the Data Highway/Data
Highway Plus/Data Highway II/Data Highway 485
Cable Installation Manual, publication 1770Ć6.2.2.
Installing a DH+ Link