CJ2 CPU Unit Software User's Manual - CIP ETI

10 CPU Unit FunctionsEnabling and Disabling Program Overwriting OverviewIn addition to using the DIP switch as described above, the program (or selected tasks) can also bewrite-protected if the write protection option is selected from the CX-Programmer when a password isbeing registered for the entire program or those selected tasks. The write protection setting can preventunauthorized or accidental overwriting of the program.CX-ProgrammerPassword?When a password is being registered for the entire userprogram or selected tasks, program write-protection can beenabled/disabled with an option setting.The user program cannot be overwritten.CPU UnitOverwriting can be prohibited with password protection,regardless of the DIP switch setting.Memory CardThe user program cannot be overwritten.• If the selected tasks or program are write-protected by selecting this option when registering a password,only the tasks (program) that are password-protected will be protected from overwriting. It willstill be possible to overwrite other tasks or programs with operations such as online editing and taskdownloading.• All tasks (programs) can be overwritten when program read protection is not enabled.• The setting to enable/disable creating program files will not take effect unless the program is transferredto the CPU Unit. Always transfer the program after changing this setting. Operating Procedure1 To register a password in the UM read protection Box or Task read protection Box, select theProhibit from overwriting to a protected program Option in the Protection Tab Page in the PLCProperties Dialog Box of the CX-Programmer.Properties2 Either select PLC - Transfer - To PLC to transfer the program or select PLC - Protection - SetPassword and click the OK button.10-54 CJ2 CPU Unit Software User’s Manual