Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 217

(4) Procedure
To control file access, register a security key in the programming tool. Then, using the registered security key,
lock the CPU module.
Programming tool
(a) Registering a security key
*1
(b) Locking the project
(c) Locking the CPU module *1
*1 The steps (b) and (c) do not need to be proceeded in particular order.
Remark
For setting details, refer to the following.
Operating manual for the programming tool used
(a) Registering a security key
Register a security key in the programming tool.
(b) Locking the project
Lock the project using the registered security key.
(c) Locking the CPU module
Lock the CPU module using the registered security key. The CPU module can be locked while it is in the STOP
or PAUSE status. The locked status is kept even during power failure and cannot be unlocked even when the
PLC memory format or PLC memory clear function is executed.
To lock the CPU module, use a USB device is recommended to avoid communications being intercepted.
Personal computer
Register a security key
to the programming tool.
CHAPTER 3 FUNCTIONS
Project
The project is locked.
3
CPU module
The CPU module
is locked.
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