Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 209

(3) Online operations that require authentication
Authentication is required to execute the following operations to password-protected files. For the authentication
method, refer to Page 210, Section 3.19.2.
• Write to PLC (data writing)
• Read from PLC (data reading)
• Online change (data writing)
• Change TC setting value (data writing)
• Verify with PLC (data reading)
• Create/Change or Delete of a password (data reading and writing)
• Write to PLC (flash ROM)
• Delete PLC data (data writing)
(4) Operating procedure
For the password registration procedure, refer to the following.
Operating manual for the programming tool used
Remark
To change, delete, or unlock the password, refer to the following.
Operating manual for the programming tool used
(5) Precautions
(a) Password management
A password registered with a file cannot be read from the file. Forgetting the registered password disables the
following operations.
• Program memory or memory card: Format PLC memory
• Standard ROM: Batch write
Record the registered password on paper and securely store the paper.
(b) Operations that overwrite files
The following operations overwrite files in the target drives (program memory and standard ROM) regardless of
the password registration setting.
• Boot operation from a memory card
• CPU module change function with memory card (Backup data restoration)
CHAPTER 3 FUNCTIONS
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