Siemens SIMATIC ET 200AL, System Manual

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Communications services
3.6 Secure Communication
Communication
Function Manual, 05/2021, A5E03735815-AJ
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3.6.2.7 Tips for error avoidance and error handling
The following description lists some use cases that may result in CPU error messages.
Diagnostic buffer provides information
The CPU detects when the password protecting confidential configuration data and the
loaded configuration do not match. A message in the diagnostic buffer indicates possible
causes and remedies and usually leads to a solution of the problem.
Typical "pitfalls"
You should pay attention to the following circumstances in order to avoid or correct errors:
•
Configuration loaded?
Regardless of whether you protect your confidential configuration data with a password
or not: without a loaded configuration, the CPU does not leave the provisioning phase.
• You are trying to load the CPU with a configured password and the CPU has already
received another password.
Example: CPU is exchanged for another CPU from the stock. The replacement CPU was not
completely reset (reset to factory settings with option "Delete password for protection of
confidential PLC configuration data").
Remedy:
– Always prepare replacement CPUs with the appropriate option (password deleted).
– For the configuration to be loaded, use the same password that was already used for
the configuration already loaded.
– It is also possible that the wrong project / CPU configuration was loaded. Check
whether the correct CPU configuration is available.
– Use the online function "Set password to protect confidential PLC configuration data"
to delete the password or to set the same password as in the CPU configuration. Then,
restart the device.
• The same error occurs if your CPU configuration does not use a password and the already
loaded configuration requires a user-defined password.
Remedy:
– Use the online function "Set password to protect confidential PLC configuration data"
to delete the password or to set the same password as in the CPU configuration. Then,
restart the device.