Siemens Simantic ET200SP System Manual page 166

Protection
8.2 Configuring access protection for the CPU
Selecting the access levels
To configure the access levels of a CPU, follow these steps:
1. Open the properties of the CPU in the Inspector window.
2. Open the "Protection" entry in the area navigation.
A table with the possible access levels is available in the Inspector window.
Figure 8-1 Possible access levels
3. Activate the desired protection level in the first column of the table. The green check
marks in the columns to the right of the access level show you which operations are still
available without entering the password. In the example (see above), read access and
HMI access are still possible without a password.
4. In the "Enter password" column, specify a password for the access level "Full access" in
the first row. In the "Confirm password" column, enter the selected password again to
guard against incorrect entries.
Ensure that the password is sufficiently secure, i.e. does not follow a pattern that can be
recognized by a machine.
5. Assign additional passwords as needed to other access levels if the selected access level
allows you to do so.
6. Download the hardware configuration to the CPU, so that the access level will take effect.
The CPU logs the entry of the correct or incorrect password and any changes in the
configuration of the access levels by a corresponding entry in the diagnostics buffer.
Behavior of a password-protected CPU during operation
The CPU protection takes effect after you have downloaded the settings to the CPU.
Before an online function is executed, the CPU checks the necessary permission and, if
necessary, prompts the user to enter a password. You can only execute password-protected
functions from one programming device/PC at any time. Another programming device/PC
cannot log on.
Access authorization to the protected data is in effect for the duration of the online
connection or until you rescind the access authorization manually with "Online > Delete
access rights".
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Distributed I/O system
System Manual, 12/2016, A5E03576849-AG