Protection
8.2 Configuring access protection for the CPU
Distributed I/O system
164 System Manual, 12/2016, A5E03576849-AG
Configuring access protection for the CPU
Introduction
The CPU offers four access levels, in order to limit access to specific functions.
By setting up the access levels and the passwords for a CPU, you limit the functions and
memory areas that are accessible without entering a password. You specify the individual
access levels as well as the entry of their associated passwords in the object properties of
the CPU.
Table 8- 1 Access levels of the CPU
Full access (no
Any user can read and change the hardware configuration and the blocks.
Read access With this access level, read-only access to the hardware configuration and the
blocks is possible without entering a password, which means you can download
the hardware configuration and blocks to the programming device. In addition, HMI
access and access to diagnostics data is possible.
Without entering the password, you cannot load any blocks or hardware configura-
tion into the CPU. Additionally, the following are
possible without the pass-
word:
• Writing test functions
• Firmware update (online)
HMI access 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
possible
without the password:
• Writing test functions
• Changing the mode (RUN/STOP)
• Firmware update (online)
No access
(complete pro-
tection)
No read or write access to the hardware configuration and the blocks is possible if
the CPU is completely protected. 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.
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