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6.19 System Protection
The CPU module has protection functions (system protection) to prevent programs being modified by a third party
other than the designer with GX Developer or serial communication module.
*1: The Q00UJCPU, Q00UCPU, and Q01UCPU do not support the system protection in units of memory cards since they
cannot use the memory card.
6.19.1 Password registration
This function prohibits reading and writing data such as a programs and device comments in the CPU module with
GX Developer.
(1) Valid password range
The password can be registered with program, device comment, and initial device values files in the specified
memory (program memory, standard ROM, and memory card).
(2) Operations that can be prohibited
The following two operations can be prohibited.
• Reading and writing a file
• Writing a file
When a password has been registered with a file, GX Developer cannot operate the file unless entered password
does not match with the registered password.
Table6.31 System protection types
Protection target
File that can be
protected
Description Method
Valid
timing
Reference
In units of memory
cards
*1
All files
Prohibits writing to a
memory card.
Turn on the write protect
switch of a memory card.
Always -
In units of files
• Program
• Device comment
• Initial device value
• Changes the attribute
for each file to either of
the following.
• Read/write (reading/
writing to programs)
prohibitation
• Write prohibitation
(operations regarding
writing such as writing
to programs and tests)
Make setting in the
Password registration
screen.
Always
Section
6.19.1