Mitsubishi Electronics 00UCPU ユーザーズマニュアル

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Empty slots can be reserved for future addition of CPU modules. Set the number of CPU modules including 
empty slots in "No. of PLC" of PLC parameter ("Multiple CPU Setting"). Then, set "PLC (Empty)" to the type of 
a target slot in PLC parameter ("I/O Assignment").

Setting "PLC (Empty)" between CPU modules

When a Universal model QCPU is used, "PLC (Empty)" can be set between CPU modules.
This is useful when adding a CPU module to the system in the future. No program modification is required because the CPU 
number set as an empty slot can be assigned to the added CPU module.

Note, however, that when the following CPU module is used, "PLC (Empty)" cannot be set to the left of the CPU module.

 • High Performance model QCPU
 • Process CPU

To add a High Performance mode QCPU to the system where a C Controller module or PC CPU module is used, move the 
C Controller module or PC CPU module to the right to allow addition of a CPU module.

Refer to the system configuration using a a High Performance model QCPU or Process CPU as CPU No.1. 

(

CPU

Power supply 

module

Power supply 

module

Universal model 

QCPU

Universal model 

QCPU

Universal model 

QCPU

Universal model 

QCPU

PLC (Empty)

Universal model 

QCPU

Motion CPU

Motion CPU

0

1

2

CPU

0

1

2

Added Universal model QCPU

Slot number

Slot number

CPU

Power supply 

module

Universal model 

QCPU

High Performance 

model QCPU

High Performance 

model QCPU

PC CPU 

module

(Empty)

Input module

Power supply 

module

Universal model 

QCPU

High Performance 

model QCPU

High Performance 

model QCPU

PC CPU 

module

Input module

0

1

2

3

4

Add a CPU module.

Slot number

Set "PLC (Empty)" to slot 2.

Keep slot 3 empty.

Move to the right.

CPU

0

1

2

3

4

Slot number