Instruction manual

3
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 ZM-300 series.
• An original network is created where the ZM-300 series (Local Port 1) that is directly
connected to the PLC is the master station, and other three ZM-300 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 ZM-300 master station and the PLC depend on the
communication speed set on the PLC. The maximum available speed for the ZM-300
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 ZM-300 series. Please use
multi-link 2 master cable (ZM-80MC) 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 network module (Ethernet, etc) is used.
2. The ZM-300 series (master or slave station) is used for the 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
Multi-link master cable
(ZM-80MC : 3m)
RS-485 connection
ZM-300 master station
ZM-300 slave station ZM-300 slave station
Local Port 1 Local Port 2 Local Port 3 Local Port 4
ZM-300 slave station