Safety Mechanisms
Fail-Safe Systems
3-8 A5E00085588-03
3.8 Password Protection for F-Systems
Password protection protects the S7 F/FH Systems from unauthorized access, e.g.
from unwanted downloads to the CPU from the engineering system (ES) or the
programming device (PG). In addition to the standard password for the CPU, an
additional password is also required for S7 F/FH Systems for the Safety Program
(F password).
The following tables describe the CPU password and the password for the Safety
Program.
CPU Password
User Input In HWCONFIG, during configuration of the CPU, "Protection" tab in the
"Properties" dialog box
User Requested • Downloading of the whole program from CFC or SIMATIC Manager
• Downloading of Safety Program changes from CFC
• Downloading and deletion of F-Blocks from SIMATIC Manager
• Downloading to the EPROM memory card on the CPU from SIMATIC
Manager
• Memory reset from CFC or SIMATIC Manager
• Modification of F constants in CFC test mode
Password
Validity
Legitimization is valid without restrictions, until explicitly withdrawn via the
corresponding SIMATIC Manager function or until all Step 7 applications
have been terminated.
Password for Safety Program
User Input
In SIMATIC Manager, Options > Edit Safety Program
User Requested • Compilation of changes to the Safety Program
• Switching safety mode on and off
• Downloading of changes to the data of the Safety Program when safety
mode is inactive
• Modification of F constants in CFC test mode
Password
Validity
An hour after the password has been entered or until the access rights are
explicitly canceled
You can find additional information on password protection in the section on setting
up, changing and canceling access rights.
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