Connection To Remote I/O Station In Melsecnet/H Network System - Mitsubishi Electric GOT2000 Series Connection Manual

4.2.1

Connection to Remote I/O Station in MELSECNET/H Network System

■1. 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 network system.
The following shows an example of connecting the GOT to 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 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.
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.
➠
(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.
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4.2 MELSEC Q Series
Network No. 1, Station No. 0
(Multiplexed remote master station)
MELSECNET/H remote I/O network
6. DIRECT CONNECTION TO CPU
MELSEC-Q/QS, Q17nD/M/NC/DR, CRnD-700
Other
Do not set the item.
Q Corresponding MELSECNET/H Network System Reference Manual (Remote I/Q network)
Settings
NW No.: Network No. of MELSECNET/H remote I/O network
Station No.: 0 (Master station)
Network No. 1, Station No. 1
(Multiplexed remote sub master station)
Standby system
CPU direct connection
GOT
(System B)
Model