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MELSEC-Q
1 OVERVIEW
(8) 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 referred to as the control PLC)
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 PLC (PLC No.1).
1) : PLC No.1
2) : PLC No.2
3) : PLC No.3
4) : PLC No.4
1
: Module controlled by
PLC No.1
2
: Module controlled by
PLC No.2
External device
Communication through GX Developer
Communication using the MC protocol
Setting from
GX Developer
Peripheral device
1 2
1
1) 2) 3) 4)
C24
Q series C24
control PLC
Q series C24
non-control PLCs
(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 PLC
2) It is possible to read the buffer memory from non-control PLCs.
Input/output signals can be used as contacts.
Buffer memory
FROM/TO instruction
Dedicated instruction
FROM
instruction
Use the input/
output signal as
a contact
Use the input/
output signal as a
contact
It should be output
to an out
p
ut si
g
nal
Data communication
Non-control PLC
Control PLC
Q series C24
External
device
X
Y