Clearing The Controller Memory - Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

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46 Controller Memory and File Types
Clearing the Controller
Memory
Publication 1763-RM001C-EN-P - October 2009
If a password is lost or forgotten, there is no way to
TIP
bypass the password to recover the program. The only
option is to clear the controller's memory.
If the Memory Module User Program has the "Load Always" functionality
enabled, and the controller User Program has a password specified, the
controller compares 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).
If you are locked out because you do not have the password for the
controller, you can clear the controller memory and download a new User
Program.
You can clear the memory when the programming software prompts you
for a System or Master Password to go on-line with the controller. To do
so:
1. Enter 65257636 (the telephone keypad equivalent of MLCLRMEM,
MicroLogix Clear Memory).
2. When the Programming Software detects this number has been
entered, it asks if you want to clear the memory in the controller.
3. If you reply "yes" to this prompt, the programming software
instructs the controller to clear Program memory.