Protection
9.2 Configuring access protection for the CPU
Distributed I/O system
156 System Manual, 09/2019, A5E03576849-AJ
9.2 Configuring access protection for the CPU
Introduction
The CPU offers four access levels 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.
Rules for passwords
Ensure that passwords are sufficiently secure. Passwords must not follow a machine-
recognizable pattern. Follow the rules below:
● Assign a password that is at least 8 characters long.
● Use different cases and characters: uppercase/lowercase, numbers and special
characters.
Access levels of the CPU
Table 9- 1 Access levels and access restrictions
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)
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