2 SYSTEM CONFIGURATION AND AVAILABLE FUNCTIONS

2.3 For Use in Multiple CPU System

MELSEC-Q

This section explains the use of the Q series C24 in a multiple CPU system.

(1)When making access from the external device to the non-control CPU of the Q series C24 using either of the following functions, use the Q series C24 of function version B.

When the Q series C24 of function version A is used, only the control CPU can be accessed. (Access to the non-control CPU will result in an error.)

•Communication using MC protocol

•Communication using GX Developer

External device

Multiple CPU system

Communication using MC protocol

Communication using GX Developer

Q series C24 of function version B

(2)If the other stations to be accessed belong to the multiple CPU system, the modules used for routing and QCPUs at the local station, all the relay stations, and the accessed station should be modules of function version B or later. This has to hold in all cases of accessing the non-control PLC of the module used for routing and the accessed station.1

(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.

Local station

Peripheral device

1) 2) 3) 4) 1 2 1'

Setting from GX Developer

External device

Communication through GX Developer Communication using the MC protocol

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

1 When accessing other stations, a module used for routing can access the following modules:

•MELSECNET/H, MELSECNET/10 network modules

•Q series C24

•Ethernet interface modules

2 - 6

2 - 6