Mitsubishi QJ71C24/-R2 User Manual page 33

1 OVERVIEW
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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
03E0 to 03E3
H H
Device memory, etc.
Data
Device memory, etc.
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.
Local station
Peripheral device
1) 2) 3) 4)
Setting from GX Developer
Relay station
1) 2) 3) 4)
MELSECNET/H
Station to be accessed
1) 2) 3) 4) 2
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
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.
Q series C24
Communication using the
MC protocol (read/write)
03FF
Specify the QCPU to be
H
accessed by the I/O number
of the requested module.
Data
1'
1 2
MELSECNET/H
1) : PLC No.1
2) : PLC No.2
3) : PLC No.3
2 2
4) : PLC No.4
1'
2
The modules used for the routing are MELSECNET/H network modules
• Ethernet interface module
MELSEC-Q
Command message
transmitted using a
QnA compatible 4C
frame
Response message
External device
Communication through GX Developer
Communication using the MC protocol
1 : Module used for routing, controlled
by PLC No.1
: Q series C24 controlled by
PLC No.1
: Module used for routing, controlled
by PLC No.2
External
device
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