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3. n : 1 Connection (Multi-link 2) 3-11
Serial Communications
3. n : 1 Connection
(Multi-link 2)
Multi-link 2
• 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 “4. n : 1 Connection (Multi-link).”
• 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 V7 series (master or slave station) is used for the temperature control network
or PLC2Way function.
PLC
RS-232C
RS-422
RS-485
CN1 MJ2 CN1 CN1 CN1
F1
F2
F3
F4
F5
F6
F7
SYSTEM
POWER
F1
F2
F3
F4
F5
F6
F7
SYSTEM
POWER
F1
F2
F3
F4
F5
F6
F7
SYSTEM
POWER
F1
F2
F3
F4
F5
F6
F7
SYSTEM
POWER
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