Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 325)

After You’ve Entered Your Program
Chapter 18
18–4
3. Type in a new password using any combination of the numbers available
on the MicroLogix 1000 HHP keypad (i.e., 0–9). You can only use
numeric-based passwords. The maximum length for a password is ten
characters.
4. Enter the new password.
ENT
R E E N T E R P A S S W R D :
Another screen appears so you can verify the new password.
5. Retype the new password, enter it, and return to the home screen.
ENT ESC ESC
Important: To remove password protection from a program, you need to
enter an empty password. To do this, follow the steps shown
above but do not type (or retype) a new password when
prompted. Instead, just press
ENT to bypass the prompts.