Entry type: FAQ, Entry ID: 26330600, Entry date: 06/18/2015
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How are messages shown in WinCC Alarm Control?

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The display of messages in WinCC Alarm Control is limited depending on the configuration and view. This entry lists the number of messages which are possible in Runtime.

1. Message list
5000 messages can be displayed in the "Message list" view on a single-user station or per server/server pair.
The following holds here:

VersionMaximum number of servers or redundant server pairsMaximum number of displayed messages
WinCC V7.2 and higher1890,000
Up to WinCC V7.01260,000
Table 01

2. Short-term archive list
The "Short-term archive list" view contains the most recent 1000 messages from all the servers/server pairs. It is updated continuously.

Fig. 01

3. Long-term archives
Up to 1000 messages are displayed on a single-user station or 1000 per server/server pair.
The following holds here:

VersionMaximum number of servers or redundant server pairsMaximum number of displayed messages
WinCC V7.2 and higher1818,000
Up to WinCC V7.01212,000
Table 02


Fig. 02

Note
Generally speaking, the limit of 1000 messages displayed per server is reached at different times. This gives rise to time slots when messages are only displayed from certain servers, even though there are also messages saved in the archive for other servers.

Example
Server 1 logs 1000 alarms a week. Server 2 logs 1000 messages over two weeks. The Alarm Control now displays a total of 2000 messages in the long-term archive window. Server 1 shows the alarms from the last week, and server 2 displays the alarms from the last 2 weeks. In this case, a misinterpretation can occur because there can have been messages from server 2 in the archive from the week before last but which are not displayed by the Alarm Control.

In order to prevent these types of gaps, the time range is set via the "selection dialog". It is important to select a time slot in which no server has archived more than 1000 messages.

In WinCC V6.2 and higher
the property "Long Time Archive Consistency" can be set to "yes". The long-term archive list then displays a maximum of 1000 messages for all the servers. They will then be consistent in any event. You can find the "Long Time Archive Consistency" setting under "Properties > Control Properties > Long Time Archive Consistency".


Fig. 03

Further Information
The WinCC Information System includes the relevant description under: "Performance Data > Configurations" und "Performance Data > Message System".