90 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Chapter 5 LCD and Keypad
The data protection for its file depends on the setting for LCD Edit Disable. If
LCD Edit Disable is set to 1 in file properties, the corresponding data file is
considered read-only by the LCD and the Protected! message displays.
For explanations in this section, we assume the following in the application
program:
• A bit file L9, which is 256 elements long (256 words), is defined with the
preset data, as shown.
• LCD Edit Disable is set to unchecked (disable).
IMPORTANT Although you cannot change protected data from the LCD keypad, the
control program or other communication devices do have access to this
data. The Protection bit (LCD Edit Disable) only provides write protection
from the LCD keypad. This does not provide any overwrite protection from
ladder logic, HMI, or programming software. It is your responsibility to
ensure that data is not inadvertently overwritten.
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