Connecting addressable dl20 masters – Rockwell Automation 2706 DL20 SERIES G USER MANUAL User Manual
Page 121
Chapter 9
Installation and Maintenance
9–10
Connecting Addressable DL20 Masters
Connect up to 32 individually addressable DL20s to an RS-422 port of a
PLC or computer. The connection is made using a 100% shielded twisted
pair cable with drain wire.
All DL20s must have their RS-422 port set for input, and their baud rates set
identically. Using in-line amplifiers, up to 100 addressable masters can be
placed on one RS-422 network up to 4,000 feet (1219 meters) in length.
Figure 9.10 illustrates how to connect addressable masters.
Figure 9.10
Connecting Addressable DL20 Masters
GND
RS-422 IN -
RS-422 IN +
RS-422 OUT +
RS-422 OUT -
RS-422 IN -
RS-422 IN +
DL20
DL20
Host PLC or
computer serial
RS-422 OUT
port.
5
4
5
4
4,000 Feet (1,219 Meters) Maximum
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