_ManagerConnections

Link0

Link1

The data point elements "Link0" and "Link1" show the connection status of the first and the second network connection when redundant network connections are used in a redundant project.

You can add an alert handling to the Link0 and Link1 elements. The check box "Alert handling with alert class" of the system overview panel is used to activate the alert handling. For information on the check box, see the system overview panel under error weighting.

If you add an alert handling to the elements, an alert is shown in the alert panel in case of errors such as loss of connection in a redundant system.

useCRC is a safety feature of the WinCC OA messaging system. It offers extended failure detection capabilities compared to the Standard messaging system. To ensure data integrity in WinCC OA Messages, these messages are divided into CRC telegrams of appropriate length each containing a 32 bit CRC.

The CRC element of the _managerConnections is 1 when CRC was activated for this connection and 0 when not. For more information, see config entry "useCRC".

In safety projects configure an alert handling for the CRC element. The alert handling triggers an alert if the CRC calculation is not activated for a specific manager connection. In a standard project the alert handling is deactivated.

For safety projects see also the document "Basic and operating Conditions" in the ETM portal.