Mitsubishi MELSEC QJ71C24, User Manual

Page: 36 / 442

1 - 10 1 - 10
MELSEC-Q
1 OVERVIEW
3) It is possible to access the control CPU and non-control CPUs using the
MC protocol and through GX Developer from the external device.
In addition, data communication with the control CPU of the Q series C24
can be performed using the non procedure/bidirectional protocol.
(Example) When communicating with the MC protocol
Non-control CPU Control CPU 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 CPU and non-control CPUs of the station
to be accessed even if the relay station and the accessed station are
multiple CPU systems.
(Example)
The QnA compatible 4C frame should be performed for access to non-
control CPUs when communicating using the MC protocol.
However, the available functions differ depending on the QCPU to be
accessed (whether it is a control CPU or a non-control CPU).
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:
• CC-Link IE Controller Network, CC-Link IE Field Network,
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 CPU of that particular module only. In
addition, it is possible to access other stations via a module controlled
by the same control CPU.