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4. HOW TO MONITOR REDUNTANT SYSTEM
4.1 Connection to Remote I/O Station in MELSECNET/H Network System
4.1.3 Ethernet connection (Connection to Ethernet module mounted on remote I/O
station)
This section explains the Ethernet connection for connecting the GOT to the Ethernet module mounted on the remote I/
O station of the MELSECNET/H network system.
The following shows an example of connecting the GOT to the Ethernet module mounted on the I/O station of the
MELESCNET/H network system.
(1) Connection method
Connect the GOT to the Ethernet module (QJ71E71-100, QJ71E71-B5, QJ71E71-B2, QJ71E71) mounted on
the remote I/O station of the MELSECNET/H network system.
For details, refer to the following.
5. ETHERNET CONNECTION
(2) GT Designer3 setting
Set GT Designer3 as follows.
In this case, the GOT monitoring is performed by transient transmission of the MELSECNET/H network system.
Therefore, a longer time-lag occurs for displaying objects compared with directly monitoring the PLC CPU.
For displaying objects with a shorter time-lag, set the device for link devices B and W of the host station set in
the MELSECNET/H network and execute the cyclic transmission.
For details, refer to the following manual.
Q Corresponding MELSECNET/H Network System Reference Manual (Remote I/Q network)
(3) Monitoring target change when system switching occurs in a redundant system
When the system switching occurs, the multiplexed remote sub master station switched to the control system
takes over the master operation of MELSECNET/H.
Since the GOT monitors the master station, the monitoring target is automatically changed to the PLC CPU that
is operating as the master.
Setting item Settings Model
Controller Type
MELSEC-Q/QS, Q17nD/M/NC/DR, CRnD-700
Device setting (Network setting) Other
NW No.: Network No. of MELSECNET/H remote I/O network
Station No.: 0 (Master station)
Q Redundant Setting Do not set the item.
Routing Information Setting
5. ETHERNET CONNECTION
Monitor target
Control system
(System A)
Network No. 1, Station No. 0
(Multiplexed remote master station)
Network No. 1, Station No. 2
(remote I/O station)
Network No. 2, Station No. 3
Network No. 2, Station No. 2
Ethernet
GOT
MELSECNET/H remote I/O network
Network No. 1, Station No. 1
(Multiplexed remote sub master station)
Standby system
(System B)
Power supply
module
Q25PRHCPU
Q25PRHCPU
QJ71LP21-25
QJ72LP25-25
QJ71E71-100
QJ71LP21-25
QJ71BR11
QJ71BR11
QJ71E71-100
QJ61BT11N
Power supply
module
Power supply
module
Empty
Empty
Empty
Empty
QJ71E71-100
QJ61BT11N
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