Programming concepts
7.6 Protection
S7-1200 Programmable controller
210 System Manual, V4.2, 09/2016, A5E02486680-AK
Access protection for the CPU
The CPU provides four levels of security for restricting access to specific functions. When
you configure the security level and password for a CPU, you limit the functions and memory
areas that can be accessed without entering a password.
Each level allows certain functions to be accessible without a password. The default
condition for the CPU is to have no restriction and no password-protection. To restrict access
to a CPU, you configure the properties of the CPU and enter the password.
Entering the password over a network does not compromise the password protection for the
CPU. Password protection does not apply to the execution of user program instructions
including communication functions. Entering the correct password provides access to all of
the functions at that level.
PLC-to-PLC communications (using communication instructions in the code blocks) are not
restricted by the security level in the CPU.
Table 7- 4 Security levels for the CPU
Full access (no
Allows full access without password protection.
Read access Allows HMI access, comparing Offline/Online code blocks, and all forms of PLC-
to-PLC communications without password protection.
Password is required for modifying (writing to) the CPU. Password is not re-
quired for changing the CPU mode (RUN/STOP).
HMI access Allows HMI access and all forms of PLC-to-PLC communications without pass-
word protection.
Password is required for reading the data in the CPU, for comparing Of-
fline/Online code blocks, for modifying (writing to) the CPU, and for changing the
CPU mode (RUN/STOP).
No access (com-
plete protection)
Allows no access without password protection.
Password is required for HMI access, reading the data in the CPU, comparing
Offline/Online code blocks, and for modifying (writing to) the CPU.
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