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App4-2
Appendix 4 1 : n Connection (Multi-drop)
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 MITSUBISHI’s instruction manual for the PLC.
V706 V Series
MJ2*2 CN1
Link unit
Link unit
Signal Pin No. Pin No.
Name
Signal
Name
Signal
Name
Signal
Name
*1
SHELL
1
FG
FG
FG
SG
5
7
SG
SG
SG
+SD
1
12
RDA
RDA
RDA
-SD
2
13
RDB
RDB
RDB
+RD
7
24
SDA
SDA
SDA
-RD
8
25
SDB
SDB
SDB
Terminating resistance
(OFF)
Terminating resistance
(OFF)
Terminating resistance
(ON)
RD terminating resistance
(ON)
*1 Pin No. 1 of CN1 is used as FG.
The metal shell of the modular jack 2 on
the V706 is used as SG.
*2 Slide the slide switch on the V706 to the
lower position for RS-422.
Link unit
* Use shielded twist-pair cables.
V-SFT Setting
The following settings must be made on the V-SFT editor.
Only the points different from those described in “V-SFT Setting (1 : 1 Connection)” (page 1-10) are
explained here.
PLC Selection
Select the PLC that is connected. Check that the PLC to be connected is ready for 1 : n connection.
Refer to the “Appendix.”
• Setting Procedure
[System Setting] → [PLC Communication] → [PLC Model] dialog
Communication Parameter Setting
• Setting Procedure
[System Setting] → [PLC Communication] → [Communication Parameters] dialog
• Setting Items
Select “1 : n” for [Connection].
PLC Port Setting
Set the port number of each PLC not in the [Communication Parameters] dialog but in the [Memory
Setting] dialog for each part.