Mitsubishi Electric MELSEC IQ-R series Reference Manual page 198

File password 32 of MELSEC-L series (4 to 32 characters)
Use the subcommand '0004'.
Subcommand '0000' can be used only when the password is not set to the file.
When subcommand 0000 is used to MELSEC-L series module, specify 20H for 4 bytes.
■When a password is set
Send password character string in 32-digit ASCII code.
Specify the password in ASCII code during data communication in binary code as well.
If the password is less than 32 characters, a space (20H) is added for the shortage of the characters.
Ex.
When the password is 'ABCDEF'
ASCII code, binary code
A B C D E
41 42 43 44 45
H H H H H
(32 digits)
■When a password is not set
Specify 20H for 32 bytes.
ASCII code, binary code
20 20 20 20 20
H H H H H
(32 digits)
12 FILE CONTROL
196
12.3 Data to be specified in commands
F
46 20 20 20
H H H H
20 20 20 20
H H H H