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Controller Memory and File Types
Password Protection
MicroLogix controllers have a built-in security system, based on numeric passwords.
Controller passwords consist of up to 10 digits (0-9). Each controller program may contain two passwords, the Password and the Master Password.
Passwords restrict access to controllers. A Master Password essentially overrides the
Password. The idea is that all the controllers in a project would have different
Passwords, but the same Master Password, allowing access to all controllers for supervisory or maintenance purposes.
You can establish, change, or delete a password by using the Controller Properties dialog box. It is not necessary to use passwords, but if used, a master password is ignored unless a password is also used.
If the Memory Module User Program has the “Load Always” functionality enabled, and the controller User Program has a password specified, the controller will compare the passwords before transferring the User Program from the Memory Module to the controller. If the passwords do not match, the User Program is not transferred and the program mismatch bit is set (S:5/9).
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