Mitsubishi Electric MELSEC Q Series User Manual page 112

(5) Mounting position of the C Controller module
Up to three C Controller modules can be mounted on slots 0 to 2 of the main base unit.
Note that the any CPU module cannot be mounted on the right side of the C Controller module.
(6) "PLC (Empty)" setting
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)" from the right side slot of the mounted CPU module in order in the I/O assignment screen of PLC parameter.
(Example)When 4 CPU modules have been set in the multiple CPU setting and 2
Mounting allowed
CPU 0 1
When using the High Performance model QCPU or Process CPU, "PLC (Empty)" cannot be set between CPU modules.
To add a CPU module to the system where the PC CPU module is used, move the PC CPU module to the right to make
room for the CPU module to be added.
CPU 0
Addition
Figure 3.11 Addition of Motion CPU when PC CPU module is mounted
High Performance model QCPUs and one Motion CPU are to be mounted.
Mount the High Performance model QCPUs in the CPU slot and slot 0 and the
Motion CPU in slot 1, and leave slot 2 "PLC (Empty)."
2 Slot number
Figure 3.10 "PLC (Empty)" setting
Set slot 2 to "PLC (Empty)".
Keep slot 3 empty.
1 2 3 4 Slot number
Move to the right.
CHAPTER3 CONCEPT FOR MULTIPLE CPU SYSTEM
Mounting not allowed
CPU 0 1 2
CPU 0 1 2 3
Slot number
4 Slot number
3 - 7
1
2
3
4
5
6
7
8