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MELSEC-Q
13 OUTLINE OF MULTIPLE PLC SYSTEMS
13.3 Differences with Single CPU Systems
The differences between single CPU systems and multiple PLC systems are explained
below.
(1) Function versions (see Sections 14.2.1 to 14.2.5)
(a) Function version B High Performance model QCPUs are supported by
multiple PLC systems. Function version A High Performance model
QCPUs cannot be used on a multiple PLC system.
(b) All I/O modules can be used on a multiple PLC system.
(c) Use function version B intelligent function modules on the multiple PLC
system.
Function version A intelligent function modules can be used if set up as
control PLC by the PLC No.1.
(2) Mounting position of CPU module (see Section 14.2.1)
High Performance model QCPUs can be mounted on the CPU slot from the
right-hand side of the power unit sequentially. The motion CPUs are mounted
together on the slot to the right of the High Performance model QCPUs.
The PC CPU module is installed on the extreme right side in the multiple PLC
system.
The total number of High Performance model QCPU, Motion CPU and PC CPU
module must be up to four.
(3) Multiple PLC system parameters (see Section 14.2.6)
In comparison with independent CPU systems, there are more PLC parameter
items on a multiple PLC system.
Of the PC parameters that have been added to the multiple PLC system, the
parameters that must be set are listed below.
• Number of CPUs: Sets the number of mounted High Performance model
QCPUs, motion CPUs and PC CPU module that are in use.
• Control PLC settings: Sets which High Performance model QCPU, motion CPU
and PC CPU module controls while modules.
(4) Sameness check (see Section 14.2.6)
A setting exists to indicate that the QCPU / motion CPU / PC CPU module used
are the same in the number of CPUs, control PLC settings and other multiple
PLC system parameters.
The High Performance model QCPU / Motion CPU / PC CPU module run a
check (sameness check) to ascertain that the multiple PLC system parameters
are the same when the PLC power is set at ON, the High Performance model
QCPU is reset, and the STOP status is changed to the RUN status.
The multiple PLC system will not start up if an error is triggered during the
sameness check.
(5) Concept of the I/O number (see Section 15.1)
The right side of the installed CPU module is I/O number "00H" in the multiple
PLC system. For this reason, the position of I/O number "00H" varies according
to the number of installed CPUs. However, because each PC CPU module
occupies two slots (one slot for CPU and one empty slot), the I/O number
deviates by the number of points set to the empty slot. (Default: empty 16 points)
Содержание QCPU (Q Mode)
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