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MELSEC-Q
13 OUTLINE OF MULTIPLE PLC SYSTEMS
(2) Multiple PLC system setup
It is necessary to set up the "Number of mounted CPU modules" and the "Control
PLC" with PLC parameters in all CPU modules onto which main base units are
mounted in order to control a multiple PLC system (see Chapter 9.)
(3) Multiple PLC system access range
(a) It is possible for a multiple PLC system's control PLC to perform the I/O
refresh procedure on control modules and write in the buffer memory of
intelligent function modules in the same way as a single CPU system.
(b) It is possible to access non-control modules in the following ways.
• Refresh the input for I/O modules and intelligent function modules (the
PLC parameter multiple PLC setup is necessary.)
• Read the intelligent function module's buffer memory.
• Download the output data for the output module, the I/O combination
module and the intelligent function modules. (the PLC parameter multiple
PLC setup is necessary.)
However, it is not possible to access non-control modules in the following
ways.
• Outputting data to the output module and intelligent function module.
• Writing data into the intelligent function module's buffer memory.
CPU
0
1
2
3
4
5
6
7
1
2
1
1
1
1
2
2
2
Possible to read with the QCPU1
P
o
we
r s
upp
ly
In
put modul
e
O
u
tpu
t mo
dul
e
Inte
llig
ent
fun
c
ti
on m
odu
le
In
put modul
e
In
put modul
e
O
u
tpu
t mo
dul
e
Inte
llig
ent
fun
c
ti
on m
odu
le
Possible to read with the QCPU2
QCP
U
QCP
U
(4) GX Developer access range
(a) It is possible to write parameter programs and perform monitoring and tests
in High Performance model QCPUs connected to personal computers,
To access High Performance model QCPUs that are not connected to
personal computers, specify the High Performance model QCPU to be
accessed (connection destination specification) with the GX Developer.
(b) It is possible for the GX Developer to access the High Performance model
QCPU regardless of the control modules and non-control modules.
By connecting a single High Performance model QCPU to a personal
computer, it is possible to perform monitoring and tests on all modules
being controlled by the multiple PLC system's High Performance model
QCPU in the same way as with a single CPU system.
Other station High Performance model QCPUs on the same
MELSECNET/H, Ethernet or other network can also be accessed.
(c) It is possible for all High Performance model QCPUs on a multiple PLC
system to be accessed from a GX Developer that is connected to other
stations on the same network.
Содержание QCPU (Q Mode)
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