Mitsubishi MELSEC-Q Series User Manual page 227

6
PARAMETER ADDED FOR MULTIPLE CPU SYSTEM
(2) Reserving empty slot
When an empty slot is reserved for the purpose of mounting additional CPU modules
in the future, set "PLC (Empty)" on the "I/O assignment" tab screen in the "PLC
parameter" dialog box.
For example, when setting "4" as "No. of CPUs" in use of High Performace model
QCPU and reserving one of them for future use, set "CPU (Empty)" to slot 3.
POINT
Diagram 6.2 Empty slot setting screen
In the mounted CPU module of CPU No.1, errors occur caused by the following
error factors (1) or (2).
(1) When the number of mounted CPU modules exceeds the number set with the
No. of CPU settings
(a) When CPU No.1 is Basic model QCPU/Universal model QCPU
"CPU LAY ERROR (error code: 7030)" occurs.
(b) When CPU No.1 is High Performance model QCPU or Process CPU
"PARAMETER ERROR (error code: 3010)" occurs.
(2) When CPU modules of which numbers are set in the No. of CPU setting are
not mounted in the CPU module mounting slots
(a) When CPU No.1 is Basic model QCPU/Universal model QCPU
"CPU LAY ERROR (error code: 7031)" occurs.
(b) When CPU No.1 is High Performance model QCPU or Process CPU
"PARAMETER ERROR (error code: 3010)" occurs.
6.1 Parameter list
6.1.1 Number of CPUs setting
1
2
3
4
5
6
7
8
6
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