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14 SYSTEM CONFIGURATION OF MULTIPLE PLC SYSTEM
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POINT
To add a High Performance model QCPU or Motion CPU to a system where the
PC CPU module is used, shift the PC CPU module to the right because no CPU
module is allowed on the right side of the PC CPU module.
(2) High Performance model QCPU, Motion CPU and PC CPU module
PLC numbers
(a)
PLC numbers are allocated for identifying the High Performance model
QCPUs, motion CPUs and PC CPU module mounted on the main base unit
in the multiple PLC system. The PLC No.1 is allocated to the CPU slot, and
the PLC No.2, No.3 and No.4 are allocated to the right of the PLC No.1.
These PLC numbers are used for the following purposes of
• To access the High Performance model QCPU when the GX Developer
(personal computer) is not connected in the multiple PLC system.
• To set up control PLCs with the I/O Assignment in the multiple PLC
system.
(b)
The High Performance model QCPU stores the host number in the special
register (SD395).
It is recommended to build a program for checking the host number using
the High Performance model QCPU.
This will enable easy verification when High Performance model QCPUs
are not mounted correctly and when programs are written into other PLCs
with the GX Developer.
In the program shown below, the annunciator (F1) is set to ON when the
High Performance model QCPU writing programs is a PLC other than the
PLC No.1 (SD395 = 1.)
The "USER" LED on the front of the High Performance model QCPU is
illuminated when the annunciator (F1) is set to ON. The number of the
annunciator that has been set at ON will also be stored in a special register
(SD62).
REMARK
For the own number confirmation method for the Motion CPU and PC CPU module,
refer to the manual of the Motion CPU and PC CPU module.
CPU slot: PLC No.1
Slot: PLC No.2
Slot: PLC No.3
Slot: PLC No.4
Set a PLC number used for comparison.
MELSEC-Q
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