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2.1.2 Parameter-valid drive
CPU modules operate according to parameter settings. Systems automatically select parameters from those stored in
the drives for CPU module operation, according to the following priority order. A user does not have to select them.
(1) Priority of the parameter-valid drives
The CPU module operates according to parameters stored in a higher priority drive.
• Q00U(J)CPU, Q01UCPU
• Q02UCPU, QnUD(H)CPU, QnUDE(H)CPU
• QnUDVCPU, QnUDPVCPU
*1 When the CPU module is locked with a security key and parameters are stored in a memory card (SD) (no parameters
stored in the program memory), "MISSING PARA" (error code: 2200) occurs.
● If a parameter file with a boot setting exists in a memory card or SD memory card, the file will be transferred according to
the setting. If the transfer target memory is set to the program memory, the file will be transferred to the program cache
memory as well.
● To check the parameter file that the CPU module uses, see "Parameter Valid Drive Information" of "PLC Status
Information" on the PLC Diagnostics window. ( Page 465, Appendix 2)
[Diagnostics] [PLC Diagnostics]
Priority Drive where parameters are stored
High
Low
1 Drive 0 (program memory)
2 Drive 4 (standard ROM)
Priority Drive where parameters are stored
High
Low
1 Drive 0 (program memory)
2 Drive 1 (memory card RAM)
3 Drive 2 (memory card ROM)
4 Drive 4 (standard ROM)
Priority Drive where parameters are stored
High
Low
1 Drive 0 (program memory)
2
Drive 2 (memory card SD)
*1
3 Drive 3 (standard RAM)
4 Drive 4 (standard ROM)
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