Using a Password
Question
I don’t want other people to use my PLC ladder programs.
It seems there is a password function for this purpose, but could you tell me more about it?
Answer
You can use a password to minimize the risk of unauthorized changes to ladder programs and function memory (data registers, internal relays, etc.).
Using a password will “lock” the PLC to prevent unauthorized access.
Once the PLC is “locked,” reading or writing to the PLC will be impossible unless the password is entered.
Note that if you forget your password, you will no longer be able to read or write to the PLC.
*There is no way for customers to initialize or cancel the password themselves.
*If you send the PLC to us, we can restore it to its factory settings, but you will not be able to read ladder programs, etc.
Please handle passwords with great care.
Password
Normal Password
Register an 8-digit number (0-9) as your password.
You will be prompted to enter the password when connecting to a ladder tool.
An error will occur if you try to write to function memory from HMI, etc.
Multi-level Password
Use the most significant character “A” as your password.
(The other seven digits should be numbers (0-9) – e.g., A1234567)
Unlike a Normal Password, this allows you to write to the function memory from HMI, etc.
| Function | Normal Password | Multi-level Password |
| Program editing operations (Read/Write/Rewrite/Delete/Insert) |
No | No |
| System parameter settings | No | No |
| Ladder program and system parameter transfer | No | No |
| Forced On/Off of internal relays, etc. Forced data writing to data registers, etc. PLC operation mode change |
No | Yes |
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