Mitsubishi Electric QJ71C24N User Manual page 36

1 OVERVIEW
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(9) Functions supporting multiple CPU systems (Details are explained
in the Reference Manual.)
(a) When accessing QCPUs in a multiple CPU system using the MC protocol or
through GX Developer, it is possible to perform data communication such as
reading/writing device data by specifying the QCPU to be accessed.
• When using the Q series C24 in a multiple CPU system, a QCPU
controlling the Q series C24 (hereinafter abbreviated as the control CPU)
should be specified using GX Developer.
It is also possible to mount a Q series C24 of function version A in a
multiple CPU system and access to the only control CPU (CPU No.1).
Peripheral device
Setting from
GX Developer
(b) When a Q series C24 CPU of function version B is used in a multiple CPU
system, the following forms of data communication can be performed with
the Q series C24.
1) It is possible to perform data communication using the non
procedure/bidirectional protocols from the control CPU
2) It is possible to read the buffer memory from non-control CPUs.
Input/output signals can be used as contacts.
Non-control CPU Control CPU
FROM/TO instruction
Dedicated instruction
FROM
instruction
Use the input/
output signal as a
Use the input/
contact
output signal as
It should be output
a contact
to an output signal
Q series C24
control CPU
1) 2) 3) 4) 1 2 1
C24
Q series C24
non-control CPUs
Q series C24
Buffer memory
X
Y
MELSEC-Q
External device
Communication through GX Developer
Communication using MC protocol
1) : CPU No.1
2) : CPU No.2
3) : CPU No.3
4) : CPU No.4
1 : Module controlled by
CPU No.1
2 : Module controlled by
CPU No.2
Data communication
External
device
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