STEP 7 Operations and Components
Windows Automation Center, WinAC Slot Version 4.0
Hardware Installation and Operating Manual, Edition 02/2006, A5E00273194-02
79
5.3 Protection
Levels
With the CPU 41x-2 PCI, a protection level can be declared, by means of which the
programs in the CPU can be protected from unauthorized access. The protection
level is used to define which programming device functions a user can execute
without having special authorization (password) on the relevant CPU. The
password enables all programming device functions.
Setting the Protection Levels
You can set protection levels (1 to 3) for a CPU in the STEP 7 Hardware
Configuration application.
The protection level set in the STEP 7 Hardware Configuration application can be
removed by performing a manual memory reset with the controls, provided a RAM
card is inserted. The protection level selected for the user program is retained on
the FLASH card.
Protection levels 1 and 2 can also be set via the controls.
The following table shows the protection levels of the CPU 41x-2 PCI:
Protection
Level
Function
Operating
Mode Selector
1
•
All programming device functions are
permitted (default setting).
RUN/STOP
2
•
All functions for process control, process
monitoring, and process communication are
permitted.
•
All information functions are permitted.
•
Loading of objects from the CPU to the
programming device is permitted, i.e., only
read-accessing programming device
functions are permitted.
RUN
3
•
Neither read- nor write-accessing
programming device functions are permitted.
-
If the protection level settings made with the mode selector and STEP 7 are
different, the higher protection level prevails (3 over 2, 2 over 1).
