Example of Using an MCD

The following graphic shows an example of using a multiple call destination system in a method notification:

The multiple call destination system shown offers three input variables and two output variables. In the multiple call destination system, a sequence of destination system calls is configured that consists of a Web service destination system and an OPC UA destination system.

Furthermore, the graphic shows that the multiple call destination system has local variables that are used during notification processing to convert or temporarily store values.

The Web service and OPC UA destination systems shown in the example can be called with current values from the input variables, output variables, or local variables of the multiple call destination system. After a destination system (for example, an OPC UA destination system) has been called successfully, the output variables of the called destination system can be assigned to the variables of the multiple call destination system.

For more information about the significance and calculation of variables, see Variables of a Multiple Call Destination System.