4.1 Connection to Remote I/O Station in MELSECNET/
H Network System
Direct CPU connection (Direct CPU connection to the remote I/O station)
This section explains the direct CPU connection that connects the GOT to the remote I/O station of the MELSECNET/H
The following shows an example of connecting the GOT to the remote I/O station of the MELSECNET/H network system.
Network No. 1, Station No. 2
(Remote I/O station)
(1) Connection method
Connect the GOT to the RS-232 interface of the network module (QJ72LP25-25, QJ72LP25G, QJ72BR15) on
the remote I/O station of the MELSECNET/H network system.
For details, refer to the following.
(2) GT Designer3 setting
Set GT Designer3 as follows.
Device setting (Network setting)
Q Redundant Setting
GT14 and GT11 are not compatible with MELSEC-QS.
Only the CPU which is connected to GT11 directly can be monitored on GT11. The setting of GT Designer3 is not necessary.
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 or using GT11, 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.
(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.
4 - 8
4. HOW TO MONITOR REDUNTANT SYSTEM
4.1 Connection to Remote I/O Station in MELSECNET/H Network System
Network No. 1, Station No. 0
(Multiplexed remote master station)
MELSECNET/H remote I/O network
6. DIRECT CONNECTION TO CPU
GT16, GT15, GT12: MELSEC-QnA/Q/QS, MELDAS C6*
GT14, GT11: MELSEC-QnA/Q, MELDAS C6*
Do not set the item.
Q Corresponding MELSECNET/H Network System Reference Manual (Remote I/Q network)
Network No. 1, Station No. 1
(Multiplexed remote sub master station)
CPU direct connection
NW No.: Network No. of MELSECNET/H remote I/O network
Station No.: 0 (Master station)