4.2 Direct CPU Connection

This section describes the direct CPU connection by which a GOT is connected to a PLC CPU in the redundant system. Two methods for the CPU direct connection, using one or two GOTs, are available.

4.2.1When using one GOT

CPU direct connection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GOT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Monitor target

 

 

 

 

 

Network No. 1, Station No. 0

 

 

 

 

 

 

 

 

Network No. 1, Station No. 1

 

 

 

 

 

(Multiplexed remote master station)

 

 

 

 

 

(Multiplexed remote sub master station)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power modulesupply

 

Q25PRHCPU

 

25-QJ71LP21

QJ71BR11

 

100-QJ71E71

QJ61BT11N

 

Empty

 

 

Power modulesupply

 

Q25PRHCPU

 

 

25-QJ71LP21

 

QJ71BR11

100-QJ71E71

QJ61BT11N

Empty

 

Control system

 

 

Standby system

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(System A)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(System B)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MELSECNET/H remote I/O network

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Network No. 1, Station No. 2

Power modulesupply

 

25-QJ72LP25

QJ71C24N

 

Empty

 

 

Empty

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(remote I/O station)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1) Connection method

Connect the GOT to the RS-232 interface of the control system CPU module (Q12PRHCPU, Q25PRHCPU) of the redundant 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

 

(Network setting)

 

 

 

 

Q Redundant Setting

 

4.9 Q Redundant Setting

 

(3)Monitoring target change when system switching occurs in a redundant system

When the system switching occurs, the PLC CPU (other station) of the control system after system switching takes over the host station operation.

Since the GOT monitors the control system, the monitoring target is automatically changed to other station.

POINT

To monitor the control system without Q redundant setting

If the system switching occurs when the Q redundant setting is not made, the GOT cannot change the monitoring target at the occurrence of system switching since it monitors the connected PLC CPU (host station).

As a countermeasure, change the cable connection from the PLC CPU in the previous control system to the control system after system switching.

1

PREPARATORYFORPROCEDURESMONITORING 2

RANGESETBE

DEVICE CANTHAT 3

RANGEACCESS MONITORINGFOR 4

MONITORTOREDUNTANTSYSTEM HOW 5

CONNECTIONBUS 6

DIRECTTOCONNECTIONCPU 7

LINKCOMPUTER CONNECTION 8

ETHERNETCONNECTION

4. HOW TO MONITOR REDUNTANT SYSTEM

4 - 11

4.2 Direct CPU Connection