August 1, 2010
The now rather obsolete DDE is a standard for interprocess communication under Microsoft Windows. Data transfer is based on the client–server principle. The server is the so-called DDE server, which, for example, communicates with a device (devices) to acquire data and provides the data to DDE clients. The DDE client can be represented by the Reliance SCADA/HMI system.
Note:
Creating, saving, and registering a configuration is specific for each type of DDE server.
Note:
It is necessary to add a new device for each group of tags (DDE topic) defined in the DDE server configuration. If no groups have been defined, the entire DDE server configuration corresponds to a single device within the visualization project.
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