206
3.19 Security Function
This function protects data in the CPU module against tampering and theft by unauthorized persons. There are four
security functions available. Use those functions according to your applications and needs.
*1 The High-speed Universal model QCPU and Universal model Process CPU do not support this function.
*2 Only the High-speed Universal model QCPU and Universal model Process CPU support these functions.
3.19.1 Password registration
This function disables reading and writing data, such as programs and device comments, in the CPU module using a
programming tool.Note 3.12
(1) Password target files
A password can be set to the following files.
•Program
• Device comment
• Initial device value
(2) Operations that are controlled and the number of characters
A password can be set to the following operations. The number of characters in the password should be four
(one-byte).
• Reading files
• Writing files
For characters allowed in passwords, refer to "Explanation of Registration Conditions" on the Input Password window.
Function Purpose Reference
Password registration
*1
To limit access to each file in the CPU module
Page 206, Section 3.19.1
File password 32
*2
Page 208, Section 3.19.2
File access control by
security key
*2
To limit devices that can access to files in the CPU module Page 213, Section 3.19.3
Remote password To limit access to the CPU module from external devices Page 218, Section 3.19.4
Block password To limit access to each POU
GX Works2 Version 1
Operating Manual
(Common)
Note 3.12
The High-speed Universal model QCPU and Universal model Process CPU do not support this function.
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