5
15. SIEMENS PLC 5-97
Connection to PLCs
Wiring Diagram 7
- Terminating Resistance Setting
Set the DIP switch 7 and 8 of the V7 series to the OFF position. Connect
terminating resistance to the serial connector (CN1) of the V7 series as shown
below. If the terminating resistance is not connected, a communication error may
occur.
Wiring Diagram 8
V7 (CN1)
D-sub 25pin(Male: )
FG
SG
+SD
−SD
+RD
SG
PLC
D-sub 9pin(Male: )
+TxD/RxD
−TxD/RxD
5
3
8
−RD
7
1
12
13
24
25
* Use shielded twist-pair cables.
D-sub 25-pin (male)
D-sub 9-pin (male)
V7 (CN1)
D-sub 25pin(Male: )
FG
SG
5V
−SD
+RD
1
7
9
+SD 12
13
24
−RD 25
390
390
220
D-sub 25-pin (male)
V7 (CN1)
D-sub 25pin(Male: )
FG
SG
+SD
-
SD
+RD
PLC
D-sub 9pin(Male: )
GND
DI+
6
5
-
RD
7
1
12
13
24
25
DI
-
8
DO+ 1
DO
-
7
* Use shielded twist-pair cables.
D-sub 25-pin (male)
D-sub 9-pin (male)
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