QUESTIONS:

 

Troubleshooting and Handling Instructions
T1	How can you set important system messages, like failure of the partner server in the case of loss of redundancy, to "requires acknowledgment"?
T2	How can a message be acknowledged automatically in the OS station?
Product and System Functions
P1	Why are messages that cannot be acknowledged displayed in the reloaded message list?

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ANSWERS:

Answer T1
How can you set important system messages, like failure of the partner server in the case of loss of redundancy, to "requires acknowledgment"?

When you create an OS project, system messages are generated from the standard WinCC environment when the OS project editor is run. These are all assigned to the message class "System, need not be acknowledged". Individual messages, like failure of a redundant partner, might however be so important that they should be set to "requires acknowledgment". For this it is recommended to proceed as follows:
 

No.	Procedure
1	Open the Alarm Logging Editor in the WinCC Explorer. Select the required single message and right-click on it to open the "Properties" (in the example Message 1012200 for failure of the partner server). Select the required properties (in the example the class, type and the option "single acknowledgment only"). Bild T1-01
2	Save the change with "OK". The changed messages are marked in color in the Alarm Logging Editor. Bild T1-02

Warning:
A message of the class "System, requires acknowledgment" is not displayed in any of the standard message lists (new list, old list, outgoing list, operation list, control system list, chronicle list). A corresponding extended selection can also be made offline or online.

Note:
These changes are not deleted after a renewed OS compilation, not even if you select "Overall reset". The changes are also retained after running the OS project editor.
Only running the OS project editor with the setting "Complete configuration" resets all the changes. However, this setting must be made manually each time you call the OS project editor, so that you cannot reset changes by mistake.

Bild T1-03

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Answer T2 
How can a message be acknowledged automatically in the OS station?

It is not possible to acknowledge a message automatically in the OS station.
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Answer P1 
Why are messages that cannot be acknowledged displayed in the reloaded message list?

The reloaded message list contains messages that cannot be acknowledged. The message can only be acknowledged when it is generated again. 
The OS server actively fetches all the messages currently available from all the automation systems when Runtime is started and displays them (with crossed-out time stamp, because that is the time of the startup, but not the time of when the fault occurred).
If the property "Reload Message List After Power Failure" is selected in the Message archive, then the old contents of the message archive are also fetched from a buffer, which means that many entries are in duplicate. In a PCS 7 project the property "Reload Message List After Power Failure" should not be enabled at all. 
If this property is enabled, messages are reloaded and possibly also messages that might have already been acknowledged. The associated driver block in the PCS 7 AS cannot accept such a message , because it has already been acknowledged.

Furthermore, the entries below are to be found in "WinCC_Sys*.log" (sample message):
....,NRMS7PMC,CquitFreiSperr::CreateTelegram: for msg-number 874592975 unknown function dwNotify

You can avoid this state by making the following entry in the message archive:
 

No.	Procedure
1	In the Alarm Logging under "Archive Configuration > Message archive" you deselect the property "Reload Message List After Power Failure". Bild P1-01

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FAQ History

Change	Date
FAQ created. FAQ 17298206 has been incorporated into the present FAQ and deleted as a separate FAQ.	April 7, 2005

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