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Open know-how-protected blocks
? Remove know-how protection for blocks
For S7-1200 (V4) and -PLCs an additional copy protection can be set up
which binds execution of the block to th

e PLC to the memory card with the defined
serial number.The S7 CPU offers three (S7-300/S7-400/WinAC) or four (S7-1200(V4)/)
access levels to limit the access to certain functions.
Setting the access level and the passwords restricts the functions and memory
areas that are accessible without a password.
The individual access levels and the respective passwords are defined in the object
properties of the CPU.The hardware configuration and the blocks can be read and modified by
anyone.
Level 2
(write
protection)
With this access level, only read access is allowed without a password,
which means that the following functions can be carried out:
? reading the hardware configuration and the blocks
? reading diagnostic data
? loading the hardware configuration and the blocks into the
programming device.
? changing the operating state (RUN/STOP)
(not for S7-300 / S7-400 / WinAC)
Without the password the following functions cannot be carried out:
? loading the blocks and hardware configuration into the CPU
? writing test functions
? firmware update (online)
Level 3
(write/read
protection)
At this access level, only
? HMI access and
? reading diagnostic data
is possible without a password.
Without the password the following functions cannot be carried out:
? loading the blocks and hardware configuration into or from the CPU,
? writing test functions
? changing the operating state (RUN/STOP)
(not for S7-300 / S7-400 / WinAC)
? firmware update (online).
Level 4
(complete
protection)
S7-1200 (v4)

With a complete protection, the CPU forbids:
? read and write access to the hardware configuration and the blocks,
? HMI access,
? modifications in the server function for PUT/GET communication,
? read and write access in the area “Accessible devices” and in the
project for devices that are switched online. A password-protected CPU has the following behavior during operation:
? The protection of the CPU becomes effective when the settings have been
loaded into the CPU and a new connection is established.
? Before an online function can be carried out, it is first checked whether it is
admissible, and if there is a password protection, the user is asked to enter the
password.
? The functions protected by a password can only be carried out by a single
PG/PC at a time. No other PG/PC can login with the same password.
? The access rights to the protected data applies only for the duration of the
online connection or until the access authorization has been removed manually
with “Online > Remove access rights”
Note The configuration of an access level does not replace the know-how protection.
This prevents unauthorized modifications in the CPU by restricting the download
rights. The blocks on the SIMATIC memory card, however, are not write or readprotected.
For protecting the program code, the know-how protection must be
used.
2.3 Copy protection (S7-1200 (V4) / )
Copy protection makes it possible to associate the entire program or the individual
block with a specific SIMATIC memory card or CPU. By associating the program
elements with a serial number of a SIMATIC memory card or a CPU, it is only