Rockwell Automation 2706-F11J_F11JC_F21J_F21JC DL50 INSTALLATION MANUAL - Manual (Page 42)

Chapter 4
Installing the DL50
4–17
Note: If noise problems occur between a DL20 master display and a slave
DL50 display (RS-232), we recommend that you connect the shield of the
communication cable to chassis ground at both ends. The earth ground for
each device must be the same potential to insure that ground currents
do not flow.
Connect the slaves to the master using Belden 9842 cable. Figure 4.14 shows
the DL40 to DL50 wiring connections.
Figure 4.14
RS-485 DL40 / RS-422 DL20 Master to DL50 Slave(s) Wiring Connections
Host Programmable Controller
or Computer
DL40 MASTER
4000 feet (1200 meters) maximum
1771 Remote I/O or
Parallel I/O
Host Programmable Controller
or Computer
To
Other
DL50s
+
–
1
2
4
5
6
1
+
–
SHLD
+
–
SHLD
DL50
RS-485
TERMINALS
DL50
RS-485
TERMINALS
2
4
5
6
8
RS-422 (+)
RS-422 (-)
DL20 MASTER
RS-422 TERMINALS
Ground
5
Parallel I/O Interface
4
To
Other
DL50s +
–
SHLD
COM
1
2
3
4
5
6
1
+
–
SHLD
COM
+
–
SHLD
COM
DL50
RS-485
TERMINALS
DL50
RS-485
TERMINALS
2
3
4
5
6
1*
2
3
4
5
6*
* Refer to Figure 4.12 for shield grounding and line
termination information.
4000 feet (1200 meters) maximum
3 COM COM 3