Protection
10.3 Configuring access protection for the CPU
Automation system
228 System Manual, 01/2023, A5E03461182-AK
Behavior of a password-protected CPU during operation
The CPU protection takes effect for an online connection after you have downloaded the
settings to the CPU. If you set a higher access level and download it to the CPU, all other
online connections will be interrupted. You must then establish a new online connection.
Before an online function is executed, STEP 7 checks the necessary permission and, if
necessary, prompts the user to enter a password. The functions protected by a password can
only be executed by one programming device/PC at any one time. Another programming
device/PC cannot log on.
Logon authorization to the protected data applies for the duration of the online connection
or for as long as you have STEP 7 open. The menu command "Online > Delete access rights"
cancels the access authorization.
You can limit access to a password-protected CPU in RUN locally on the display. This prevents
access even with the password.
Access level for F-CPUs
For the fail-safe CPUs, there is an additional access level in addition to the four described
access levels. For more information on this access level, refer to the description of the fail-
safe system SIMATIC Safety Programming and Operating Manual SIMATIC Safety -
Configuring and Programming
(https://support.automation.siemens.com/WW/view/en/54110126).
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