1. Before Connecting to PLC 1-3
n : 1 Connection (Multi-link 2)
Outline
• One PLC is connected to a maximum of four V7 series.
• An original network is created where the V7 series (Local Port 1) that is directly connected to the
PLC is the master station, and other three V7 series are slave stations. Only the master station
makes communications directly with the PLC, and the slave stations make communications with
the PLC via the master station.
• Communications between the V7 master station and the PLC depend on the communication
speed set on the PLC. The maximum available speed for the V7 series is 115 kbps, which is
higher than the one available with multi-link connection described in “n : 1 Connection (Multi-link)”
(page 1-4).
• This multi-link connection is available with almost all the PLC models that support 1 : 1 connection
(refer to the “Appendix”).
The connection between the master station and the PLC is the same as the one for 1 : 1
connection.
• Use the RS-485 2-wire connection between stations of the V7 series. Please use Hakko
Electronics’ multi-link 2 master cable (V6-MLT) for connection between the master station (Local
Port 1) and the slave station (Local Port 2).
• In the following cases, multi-link 2 connection is not available.
1. A communication interface unit (example: OPCN-1, CC-LINK, Ethernet, etc.) is used.
2. The V6 series (master or slave station) is used for the temperature control network or
PLC2Way function.
• The V7 and V6 series can be used together. The V6 series can be the master station.
(However, when V606/V606i is the master station, the slave station must be V606/V606i. Also,
depending on the hardware version of the V6 series, multi-link 2 connection may not be supported.
Refer to the V6 Hardware Specifications.)
Notes on Connection
For more information, refer to “Appendix 2, n : 1 Connection (Multi-link 2).”
PLC
RS-232C
RS-422
RS-485
CN1 MJ2 CN1 CN1 CN1
Hakko Electronics’ cable
“V6-MLT” (3 m)
RS-485 connection
V7 master station V7 slave station V7 slave station
Local port 1 Local port 2 Local port 3 Local port 4
V7 slave station
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