Set password modification in the program menu bar file [program project properties],it means that the file can't open
Modify the password in the program menu bar PLC [PLC password],it means that PLC forbids downloading.
Set and modify the password in the PLC main program block or sub-program block (right click on the program properties)
Download the program,tick "forbid upload",it means that the program can not be uploaded to PC.
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