6F3B0253
Basic Hardware and Function 103
6. Programming Information
6.10 Password protection
The T1-16S has the password function to protect the user program and data from
unauthorized operations.
There are four levels of protection. Accordingly, three levels of passwords can be
registered to control the protection levels.
These passwords are stored in the built-in EEPROM. Therefore, if you entered,
changed or cleared the passwords, the EEPROM write operation is necessary.
The outline of the protection levels are shown below. For details, refer to the manual
for the programming tool.
Protection level 4 (disabled functions)
• Writing register/device data
• Writing system information
• I/O allocation
Protection level 3 (disabled functions)
• Reading program
• Program write into EEPROM
Protection level 2 (disabled functions)
• Clear memory
• Writing/loading program
• T1/T1S operation mode changes (by programming tool)
• Setting/changing passwords
Protection level 1 (disabled functions)
• None (all functions are available)
When the level 1, 2 and 3 passwords are registered, the T1-16S will be started as
protection level 4. In this state, for example, entering the level 2 password changes
the protection level to 2.
When you use the password function, do not forget the level 1 password.
Otherwise, you cannot change/release the registered passwords.
Strict
NOTE