Mitsubishi Electric MELSEC L Series User Manual page 122

(2) Authentication by the MC protocol
To access a password-protected file from external devices using the MC protocol, the request message format of
the MC protocol must be changed and a command for the file password 32 must be specified.
1.
2.
3.
File delete
File attribute change
File copy
File open
For details, refer to the following.
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Add "Keyword" at the end of the request message, and set a password in that area.
Authenticate the password using the password set to "Keyword".
For the commands requiring password authentication, specify 0004 (for file password 32) in the
"Subcommand" area of the request message.
Function
MELSEC Communication Protocol Reference Manual
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Command (subcommand)
1822 (0004)
1825 (0004)
1824 (0004)
1827 (0004)