1 OVERVIEW

MELSEC-Q

3)It is possible to access the control PLC and non-control PLCs using the MC protocol and through GX Developer from the external device.

In addition, data communication with the control PLC of the Q series C24 can be performed using the non procedure/bidirectional protocol. (Example) When communicating with the MC protocol

Non-control PLC

Control PLC

Q series C24

 

 

Communication using the

 

 

MC protocol (read/write)

03E0H to 03E3H

03FFH

Specify the QCPU to be

accessed by the I/O number

of the requested module.

Data

Device memory, etc. Data

Device memory, etc.

Command message transmitted using a QnA compatible 4C frame

Response message

External device

If the MC protocol, GX Developer is used to access other stations, it is possible to access the control PLC and non-control PLCs of the station to be accessed even if the relay station and the accessed station are multiple CPU systems.

(Example)

 

 

 

It is possible to access other stations regardless

 

 

 

 

 

 

 

 

 

 

 

 

of whether the control PLC of the module to be

 

 

 

 

 

 

 

 

 

 

 

 

routed through is the same or different.

 

 

External device

Peripheral device

Local station

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1)

2)

 

3)

4)

1

2

 

1'

 

 

Communication through GX Developer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Communication using the MC protocol

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Setting from GX Developer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MELSECNET/H

 

 

 

 

 

 

 

 

 

 

 

Relay station

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1)

: PLC No.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2) : PLC No.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1)

 

 

2)

 

3)

4)

 

2

 

 

2

 

 

 

 

 

 

 

3) : PLC No.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4) : PLC No.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

: Module used for routing, controlled

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

by PLC No.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MELSECNET/H

 

 

Station to be accessed

1'

: Q series C24 controlled by

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PLC No.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1)

2)

3)

4)

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 : Module used for routing, controlled

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

by PLC No.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The modules used for the routing are MELSECNET/H network modules

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The QnA compatible 4C frame should be performed for access to non- control PLCs when communicating using the MC protocol.

However, the available functions differ depending on the QCPU to be accessed (whether it is a control PLC or a non-control PLC).

See the Reference Manual for the available functions and accessible range.

A module used for routing can access the following modules when accessing other stations:

•MELSECNET/H, MELSECNET/10 network module

•Q series C24 • Ethernet interface module

If there is a module of function version A among the modules for routing, it is possible to access the control PLC of that particular module only. In addition, it is possible to access other stations via a module controlled by the same control PLC.

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