Siemens SIMATIC ET 200SP System Manual page 158

Access levels
HMI access
No access
(complete pro-
tection)
An enumeration of which functions are available in the different protection levels is available
in the "Setting options for the protection" entry in the STEP 7 online help.
Properties of the access levels
Each access level allows unrestricted access to certain functions without entering a
password, for example, identification using the "Accessible devices" function.
The CPU's default setting is "No restriction" and "No password protection". In order to protect
access to a CPU, you need to edit the properties of the CPU and set up a password. In the
default access level "Full access (no protection)" every user can read and change the
hardware configuration and the blocks. A password is not set and is also not required for
online access.
Communication between the CPUs (via the communication functions in the blocks) is not
restricted by the access level of the CPU, unless PUT/GET communication is deactivated in
the "No access" (complete protection) access level.
Entry of the right password allows access to all the functions that are allowed in the
corresponding 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 by restricting the rights to download the hardware and software configuration to the
CPU. However, blocks on the SIMATIC memory card are not write- or read-protected. Use
know-how protection to protect the code of blocks on the SIMATIC memory card.
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
Access restrictions
With this access level only HMI access and access to diagnostics data are possi-
ble without entering the password.
Without entering the password, you can neither load blocks nor the hardware
configuration into the CPU, nor load blocks and hardware configuration from the
CPU into the programming device. Additionally, the following are not possible
without the password:
Writing test functions
•
Changing the mode (RUN/STOP)
•
Firmware update (online)
•
Display of the online/offline comparison status
•
When the CPU has complete protection, no read or write access to the hardware
configuration and the blocks is possible (without access authorization in the form
of a password). HMI access is also not possible. The server function for PUT/GET
communication is disabled in this access level (cannot be changed).
Authentication with the password will again provide you full access to the CPU.
9.2 Configuring access protection for the CPU
Protection
157