Mitsubishi Electric GOT2000 Series Connection Manual page 231

■2. Serial communication connection (Connection to serial communication module mounted
on remote I/O station)
This section explains the serial communication connection that connects the GOT to the serial communication 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 serial communication module mounted on the remote I/
O station of the MELSECNET/H network system.
Monitor target
Control system
(System A)
Network No. 1, Station No. 2
(Remote I/O station)
(1) Connection method
Connect the GOT to the serial communication module (QJ71C24, QJ71C24-R2, QJ71C24N, QJ71C24N-R2,
QJ71C24N-R4) or modem interface module (QJ71CM0) mounted on the remote I/ O station of the MELSECNET/H
network system.
For details, refer to the following.
➠
7. SERIAL COMMUNICATION CONNECTION
(2) GT Designer3 setting
Set GT Designer3 as follows.
Setting item
Controller Type
Device setting (Network setting)
MELSEC Redundant Setting
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.
Network No. 1, Station No. 0
(Multiplexed remote master station)
MELSECNET/H remote I/O network
MELSEC-Q/QS, Q17nD/M/NC/DR, CRnD-700
NW No.: Network No. of MELSECNET/H remote I/O network
Other
Station No.: 0 (Master station)
Do not set the item.
Network No. 1, Station No. 1
(Multiplexed remote sub master station)
Serial communication
connection
GOT
Settings
4.2 MELSEC Q Series
Standby system
4
(System B)
Model
4 - 55