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1 GENERAL DESCRIPTION
MELSOFT
1.1.3 CPU access password
A safety CPU performs access certification by using a password to prevent the
misconnected GX Developer from illegally operating.
The password is referred to a CPU access password.
The CPU access password has to be set to both the GX Developer project and
safety CPU.
When performing the operation that changes control (e.g. program change) from the
GX Developer, the CPU access password of the GX Developer project is compared
with that of the safety CPU.
Only when they are identical, the operation will be allowed.
GX Developer GX Developer
CPU access
password
"ABC123"
CPU access
password
"DEF123"
Can operate, as the CPU access
passwords are identical.
Cannot operate, as the CPU access
passwords are not identical.
CPU access password "ABC123"
Project A Project B
POINT
Set different CPU access passwords for each safety CPU.