Mitsubishi MELSEC-Q Series User Manual page 129

3
CONCEPT FOR MULTIPLE CPU SYSTEM
(b) Checking host CPU number
Remark
For checking method of the host CPU No.s of the Motion CPU, C Controller module,
and PC CPU module, refer to the manuals of each CPU module.
• Setting a control CPU in the I/O assignment.
The QCPU stores the host number in the special register (SD395).
It is recommended to create a program for checking the host number on the
QCPU.
This will enable easy verification when QCPUs are not mounted correctly and
when programs are written into other CPUs with GX Developer.
In the program shown in Diagram 3.18, the annunciator (F1) turns to ON when
QCPU to which a program is written is other than CPU No.1 (SD395 = 1.)
The "USER" LED on the front of the QCPU is illuminated when the annunciator
(F1) turns ON.
The number of the annunciator that has turned ON will be stored in the special
register (SD62).
<> K1
Set the CPU No. for comparison.
Diagram 3.18 Program for checking host CPU No.
Diagram 3.17 Control CPU setting
SD395 SET
3.2 CPU No. of CPU module
Control CPU
(Control PLC)
setting
F1
3
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