Mitsubishi MELSEC-Q Series User Manual page 205

5
SETTINGS AND PROCEDURES BEFORE OPERATION
(2) Precautions
(a) Application of login user setting of C Controller module
(b) When security must be kept against illegal access from outside
(c) Characters applicable to user name and password
(d) Retention of set login user
Although the login user setting of the C Controller module restricts user access for
the C Controller setting operations, it does not completely prevent illegal access
from outside.
Please take preventive measures at user's discretion when it is necessary to
protect the C Controller system from illegal access from outside.
It is recommended to take into account the following.
1) To prevent illegal access from outside, use the module on a LAN.
2) Observe the following to prevent the account setting (user name, password)
from being leaked.
• Avoid setting of a simple account made of alphanumeric characters only.
• Include some symbols ($&?) to make a difficult-to-guess user name and
password.
• Delete the default account with the loginUserDelete function to prevent
illegal access by the default account.
<Program example>
Delete the default account by the loginUserDelete function on VxWorks.
Set it in the script file or user program.
loginUserDelete ("target", "password");
Refer to Appendix 5 for details.
Using any character other than those indicated in Appendix 5 may prevent the
restricted functions (
The set login user information is cleared and returns to the default when the C
Controller module is powered off or reset.
To hold the login user setting, describe the script file to which the login user setting
is registered (added/deleted).
In the script file, describe either of the following:
• Directly describe the login user operation commands (loginUserAdd function,
loginUserDelete function)
• Make a description to start the user program task for login user operation.
Section 5.11.1) from normal operation.
5.11 Login User Setting and Restrictions
5.11.2 Login user setting
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