4.1Connection to Remote I/O Station in MELSECNET/ H Network System

4.1.1Direct 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

 

module

supplyPower

Q25PRHCPU

Control system

 

 

 

(System A)

 

 

 

Network No. 1, Station No. 0 (Multiplexed remote master station)

25-QJ71LP21

QJ71BR11

100-QJ71E71

QJ61BT11N

Empty

supply Power module

Q25PRHCPU

Network No. 1, Station No. 1 (Multiplexed remote sub master station)

25-QJ71LP21

QJ71BR11

100-QJ71E71

QJ61BT11N

Empty

Standby system

(System B)

MELSECNET/H remote I/O network

Network No. 1, Station No. 2 (Remote I/O station)

supply Power module

25-QJ72LP25

QJ71C24N

Empty

Empty

CPU direct connection

GOT

(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.

6. DIRECT CONNECTION TO CPU

(2)GT Designer3 setting

Set GT Designer3 as follows.

Setting item

Settings

Model

 

 

MELSEC-QnA/Q/QS, MELDAS C6*

 

Controller Type

 

 

 

 

 

MELSEC-QnA/Q, MELDAS C6*

 

Device setting

Host

Host

 

Remote master

Other (NW No. 1 (network No. of remote I/O network),

 

(Network setting)

 

station

Station No. 0 (master station))

 

 

 

Q Redundant Setting

 

Do not set the item.

 

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.

(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. HOW TO MONITOR REDUNTANT SYSTEM

 

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