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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.
Protection target
In units of memory
All files
*1
cards
• Program
In units of files
• Device comment
• Initial device value
*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.
6 - 106
Table6.31 System protection types
File that can be
protected
Prohibits writing to a
memory card.
• 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)
Description
Turn on the write protect
switch of a memory card.
Make setting in the
Password registration
screen.
Valid
Method
timing
Always
Always
Reference
-
Section
6.19.1
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