Wednesday, November 20, 2024
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OPC - OLE (Object Linking and Embedding) for Process Control :: The Industrial Interoperability Standard

DDE - What is it?
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  • OLE’s predecessor, Dynamic Data Exchange, is a method of dynamically moving data among applications in the Microsoft Win32 Application Programming Interface (API).


  • The DDE protocols send messages between applications that share data and use shared memory to exchange data.


  • Applications can use the DDE protocol for one-time data transfer and for continuous exchanges in which applications send updates to one another as new data become available.


  • Prior to OPC, hardware manufacturers that recognized the need for software connectivity to their hardware was limited in their ability to develop drivers—the choice was between DDE and a list of proprietary DDE derivatives. Selecting any of these had possible
    effects of limiting the user’s choice of software or preventing the acceptance of the hardware.


  • Due to OPC data exchange popularity, DDE is becoming less popular.




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    Response Time ../ PLC (Programmable Logic Controller) ../ Simplex ../ DOX (Data Operated Transmit) ../ Duplexer ../ Half Duplex ../ Store and Forward ../ Baud ../ Thermocouple - How do I choose a Type? ../ Synchronous ../ VSTO - What is it? ../ FM (Frequency Modulation) ../ SCADA ../ DCE (Data Communication Equipment) ../ Binary ../ RTS (request to send) ../ Remote Terminal ../ Isotropic ../ MHz (Megahertz) ../ HART ../ See More..
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