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3-10 2. 1 : n Connection (Multi-drop)
V-SFT Setting
The following settings must be made on the V-SFT editor. Only the points different from
those described in “1 : 1 Connection/V-SFT Setting” (page 3-3) 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 Position
[System Setting] → [PLC Type] → [Select PLC Type] dialog
Communication Parameter Setting
• Setting Position
[System Setting] → [Comm. Parameter] → [Comm. Parameter] dialog
• Setting Items
Select “1 : n” for [Connection].
PLC Port Setting
Set the port number of each PLC not in the [Comm. Parameter] dialog but in the [Memory
Setting] dialog for each part.
Notes on Communication Errors
• Be sure to select the PLC memory either for [Read Area] or [Calendar] in the [Comm.
Parameter] dialog.
• Processing for PLC failure
When a communication error or timeout has been detected during communications with
a PLC, no further communication with this PLC is attempted until the display screen
changes. The information of PLC failure is stored in the V7 internal system memory
address $s114 to 129.
• In the case that the internal memory is set for [Read Area], [Write Area] and [Calendar],
no initial connection check is performed, and calendar information is read when the V7
series establishes communications with the PLC for the first time. A communication
error occurs on the V7 series if a timeout is detected while accessing the PLC.
Supplemental Information: Internal system memory
The internal system memory is the one for the V7 series
system.