Mitsubishi MELSEC-Q Series User Manual page 122

3
CONCEPT FOR MULTIPLE CPU SYSTEM
(6) "PLC (Empty)" setting
Diagram 3.14 Addition of the High Performance model QCPU when the PC CPU module is mounted
3
- 11 3.1 Mounting Position of CPU Module
3.1.3 When CPU No.1 is Universal model QCPU
An empty slot can be reserved for future addition of a CPU module.
Select the number of CPU modules including empty slots at No. of PLC and set the
type of the slots to be emptied to "PLC (Empty)" in the I/O assignment screen of PLC
parameter.
POINT
When using the Universal model QCPU, "PLC (Empty)" can be set between CPU
modules.
Therefore, even when the CPU module will be added to the system, CPU No. of a
CPU module to be added is not changed, and changing the program is
unnecessary.
CPU 0 1 2
Diagram 3.13 "PLC (Empty)" setting between CPU modules
Note that when using either of the following CPU modules, "PLC (Empty)" cannot
be set to the left side of the CPU module.
• High Performance model QCPU
• Process CPU
To add the High Performance model QCPU to the system including the PC CPU
module/C Controller module, the PC CPU module/C Controller module must be
moved to the right edge.
CPU 0 1 2 3
Addition
Move these modules to the right.
Slot number
Set slot 2 to "PLC (empty)".
Keep slot 3 empty.
4 Slot CPU
number
CPU 0 1 2
Added Universal model
QCPU
0 1 2 3 4
Slot number
Slot
number