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2. 1 : n Connection (Multi-drop) 3-9
Serial Communications
2. 1 : n Connection
(Multi-drop)
1 : n Connection
One V7 series is connected to multiple PLCs. (Maximum connectable PLCs: 32)
Wiring (RS-422/485)
For connecting information, refer to the instruction manual for the PLC.
Example:
The following example shows how one V7 series is connected to three PLCs made by
MITSUBISHI. For more information, refer to the MITSUBISHI’s instruction manual for
the PLC.
PLC1 PLC2 PLC3 PLCn (n=1 ~ 32)
CN1
F1
F2
F3
F4
F5
F6
F7
SYSTEM
POWER
Maximum length (V7 series to the terminating PLC) = 500 m
RS-422/RS-485 connection
V7 series
(n = 1 to 32)
FG
RDA
RDB
SDA
SDB
SG
FG
RDA
RDB
SDA
SDB
SG
FG
+SD
-SD
+RD
-RD
SG
1
12
13
24
25
7
FG
RDA
RDB
SDA
SDB
SG
* Use shielded twist-pair cables.
Signal
Pin No.
V7 (CN1)
RD terminating
resistance
(ON)
Link unit Link unit Link unit
Signal Signal
Terminating
resistance
(OFF)
Terminating
resistance
(OFF)
Terminating
resistance
(ON)
Signal