Siemens SIMATIC S7-1500 System Manual page 238

Protection
10.3 Configuring access protection for the CPU
Entering the correct password enables access to all the functions that are allowed in the
given level.
NOTE
Configuring an access level does not replace know-how protection
Configuring access levels offers a high degree of protection against unauthorized changes to
the CPU through network access. Access levels restrict the rights to download the hardware
and software configuration to the CPUs. However, blocks on the SIMATIC memory card are
not write-protected or read-protected. Use know-how protection to protect the code of
blocks on the SIMATIC memory card.
Behavior of functions in different access levels
The STEP 7 online help includes a table listing the online functions available in the various
access levels.
Configuring access levels
Proceed as follows to configure the access levels for the CPUs:
1. Open the properties of the CPUs in the Inspector window.
2. Open "Protection & Security" in the area navigation.
A table with the possible access levels appears in the Inspector window.
Figure 10-1 Possible access levels
3. Activate the required protection level in the first column of the table. The green check
marks in the columns to the right of the access level show which operations are still
possible without entering the password. In the example (Figure: Possible access levels),
read access and HMI access are still possible without a password.
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S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD