User's Manual

4. HOW TO MONITOR REDUNTANT SYSTEM
4.1 Connection to Remote I/O Station in MELSECNET/H Network System
4 - 9
1
PREPARATORY PROCEDURES FOR MONITORING
2
DEVICE RANGE THAT CAN BE SET
3
ACCESS RANGE FOR MONITORING
4
HOW TO MONITOR REDUNTANT SYSTEM
5
BUS CONNECTION
6
DIRECT CONNECTION TO CPU
7
COMPUTER LINK CONNECTION
8
ETHERNET CONNECTION
4.1.2 Computer link connection (Connection to serial communication module
mounted on remote I/O station)
This section explains the computer link 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.
(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. COMPUTER LINK 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, execute the cyclic transmission so that the GOT can monitor link
devices B and W of the host station set in the MELSECNET/H network.
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-QnA/Q/QS, MELDAS C6*
MELSEC-QnA/Q, MELDAS C6*
Device setting
(Network setting)
Host Host
Remote master
station
Other (NW No. 1 (network No. of remote I/O network),
Station No. 0 (master station))
Q Redundant Setting Do not set the item.
Monitor target
MELSECNET/H remote I/O network
Computer link connection
GOT
Network No. 1, Station No. 0
(Multiplexed remote master station)
Q25PRHCPU QJ71LP21-25 QJ71BR11 QJ71E71-100 QJ61BT11N
Network No. 1, Station No. 1
(Multiplexed remote sub master station)
Standby system
(System B)
Q25PRHCPU QJ71LP21-25 QJ71BR11 QJ71E71-100 QJ61BT11N
QJ72LP25-25 QJ71C24N
Network No. 1, Station No. 2
(Remote I/O station)
Empty Empty
Empty Empty
Power supply module
Power supply module
Power supply module
Control system
(System A)