System Protect; Password Registration - Mitsubishi Electric MELSEC-Q Series User Manual

7 FUNCTION

7.14 System Protect

Item to protect Protect valid file
Program
File unit Device comments
Device initial values

7.14.1 Password registration

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Basic model QCPU has a few protection functions (system protect) for the program
changes to processing of general data obtained from a third party other than the
designer (access processing from GX Developer function or serial communication
module).
There are the following methods for system protects.
Protection description
The attributes for a file is
changed to the following:
1) Read/Write display prohibit
2) Write prohibit
The control instruction, read/write display, and write are mentioned above are as follows:
Item
Read/Write display
Write
Password is used to prohibit the data read and write of the program and comments in
Basic model QCPU from a GX Developer peripheral device.
The Password Registration is set for the specified memory (program memory/standard
memory) program file, device comment file, and device initial file.
There are two descriptions of items to be registered.
• The file name is not displayed and read/write cannot be performed as well.
• Write cannot be performed to the file. (Read only)
If the password is registered, file operations from GX Developer cannot be performed
unless the same password is input.
Method
Change the attributes for
the file in the Password
Registration.
Program read/write operations.
Operation that writes the program and tests.
MELSEC-Q
Valid
Timing
Always
Description
Remarks
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