C.3 Connecting to a Network
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual 561
MEMOBUS/Modbus
Communications
C
Note: 1. Turn on the DIP switch S2 on the drive that is located at the end of the network. All other slave devices must have this DIP switch set
to the OFF position.
2. Set H5-07 to “1” when using the RS-485 interface.
■ RS-422 Interface
Figure C.4
Figure C.4 RS-422 Interface
Note: 1. Turn on the DIP switch S2 on the drive that is located at the end of the network. All other slave devices must have this DIP switch set
to the OFF position.
2. Set H5-07 to 0 when using RS-422 interface in a point-to-point circuit.
Set H5-07 to 1 when using RS-422 interface in a multi-drop circuit.
◆ Network Termination
The two ends of the MEMOBUS/Modbus network line have to be terminated. The drive has a built in termination
resistor that can be enabled or disabled using DIP switch S2. If a drive is located at the end of a network line, enable the
termination resistor by setting DIP switch S2 to the ON position. Disable the termination resistor on all slaves that are not
located at the network line end.
Figure C.5 illustrates the setting of DIP switch S2.
To set the DIP switch on the terminal board, use an appropriate sized tool with a tip of approximately 8 mm in width.
Figure C.5
Figure C.5 Serial Communications Terminal and DIP Switch S2
R–
R+
S
–
S+
IG
PLC
U1000
U1000
U1000
S–
S+
R
–
R+
IG
S
–
S+
R
–
R+
IG
S
–
S+
R
–
R+
IG
S2
OFF
S2
OFF
S2
ON
DIP switch S2
(OFF: default)
OFF
ON
O
N
RS-422
or
RS-485
R
-
R+
DIP
switch
S2
S
-
S+
+
-
Termination resistor (1/2 W, 120 Ω)
SIEP_C710636_02B_1_0.book 561 ページ ２０１５年１１月２５日 水曜日 午後４時５６分
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