_ManagerConnections

The _ManagerConnections data point type contains the manager connections as well as settings for the remote UI, the system overview panel and the CRC messaging system.

Data point element Type Description

Link0

Link1

bool

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.

CRC bool

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 [event] 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", see Safety Manual - Basic and Operating Conditions V.

TimeDiff float When starting a remote UI client, the difference to the server system time is stored in the internal data point element _ManagerConnections.TimeDiff in seconds. See chapter Synchronisation Client-Server.
RefreshStatus int

The data point element "RefreshStatus" indicates the current state of a refresh operation for the manager connection.

Possible values are:

  • 0: None (default), no refresh in progress
  • 1: Started, Manager got the refresh command and will now send the DISCONNECT_ALL (to disconnect everything) and then all dpConnects respectively dpQueryConnects to reconnect messages.
  • 2: Sent: All messages have been sent, manager is waiting for the last response.

After receiving the last response (as indicated by state "2") the client will set the status of the DPE back to 0.

Note: For distributed systems, as the DP "_ManagerConnections" does not contain the system number, the system name is included within the data point name for the connection, e.g. dist_<system>_1.