Protection
9.3 Using the user program to set additional access protection
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
159
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".
Access levels for F-CPUs
For the fail-safe CPUs, there is an additional access level in addition to the four described
access levels. For additional information on this access level, refer to the description of the
fail-safe system SIMATIC Safety Programming and Operating Manual SIMATIC Safety -
Configuring and Programming
(http://support.automation.siemens.com/WW/view/en/54110126
).
9.3 Using the user program to set additional access protection
Access protection via user program
You can also restrict access to a password-protected CPU in STEP 7 via the ENDIS_PW
operation. You can find a description of this block in the online help under the keyword
"ENDIS_PW: Limit and enable password legitimation".
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