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MELSEC-Q
1 OVERVIEW
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
Specify the QCPU to be
accessed by the I/O number
of the requested module.
External
device
Command message
transmitted using a
QnA compatible 4C
frame
03FF
H
03E0
H
to 03E3
H
Device memory, etc.
Data
Response message
Communication using the
MC protocol (read/write)
Device memory, etc.
Data
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)
MELSECNET/H
1) : PLC No.1
2) : PLC No.2
3) : PLC No.3
4) : PLC No.4
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
1'
2
Local station
Relay station
External device
Communication throu
g
h GX Develope
r
Communication using the MC protocol
Setting from GX Developer
Peripheral device
MELSECNET/H
Station to be accessed
1 2
1'
1) 2) 3) 4)
2 21) 2) 3) 4)
21) 2) 3) 4)
It is possible to access other stations re
g
ardless
of whether the control PLC of the module to be
routed through is the same or different.
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.