Mitsubishi MELSEC L Series User Manual page 112

(2) Writing to the CPU module
Write the remote password to the CPU module from the "Write to PLC" screen.
[Online]
After writing the parameters to the CPU module, power off and then on or reset the CPU module to enable the
parameters.
(3) Unlocking or locking the remote password
The remote password is unlocked or locked from an external device such as a personal computer, as described
below.
(a) When using MELSOFT connection
Enter a remote password in the following dialog box that appears during communication.
When the remote password is entered, the programming tool performs unlock processing and then accesses
the CPU module
(b) When using MC protocol
Use commands dedicated to MC protocol. (
(c) When using the FTP function
Use the "password-lock" and "password-unlock" commands. (
110
[Write to PLC]
Page 33, Section 5.2.1)
Page 94, Section 8.4.1)