Rockwell Automation 1762-Lxxxx MicroLogix 1200 Programmable Controllers - Manual (Page 76)

Publication 1762-UM001G-EN-P - March 2011
4-10 Communication Connections
DH-485 Communication Cable
The suggested DH-485 communication cable is either Belden #3106A or
#9842. The cable is jacketed and shielded with one or two twisted-wire pairs
and a drain wire.
One pair provides a balanced signal line and one additional wire is used for a
common reference line between all nodes on the network. The shield reduces
the effect of electrostatic noise from the industrial environment on network
communication.
The communication cable consists of a number of cable segments
daisy-chained together. The total length of the cable segments cannot exceed
1219 m (4000 ft). However, two segments can be used to extend the DH-485
network to 2438 m (8000 ft). For additional information on connections using
the AIC+, refer to the Advanced Interface Converter (AIC+) User Manual,
publication 1761-UM004.
When cutting cable segments, make them long enough to route them from one
AIC+ to the next, with sufficient slack to prevent strain on the connector.
Allow enough extra cable to prevent chafing and kinking in the cable.
Use these instructions for wiring the Belden #3106A or #9842 cable. (See
Cable Selection Guide on page 4-13 if you are using standard Allen-Bradley
cables.)
Connect the Communication Cable to the DH-485 Connector
TIP
We recommend a daisy-chained network. Do not
make the incorrect connection shown below:
Belden #3106A
or #9842 Belden #3106A or
#9842 Belden #3106A or
#9842
Connector
Connector
Connector
Incorrect