OPC - OLE (Object Linking and Embedding) for Process Control :: The Industrial Interoperability Standard
DDE - What is it? Knowledge Base
most important key terminologies you need to know if you work in Automation, Controls, Brilliant Manufacturing, Operational & Industrial Intelligence or IoT etc.
; regardless of any vendor(s) you are dealing (Allen Bradley, GE Fanuc, Siemens, Modicon, Mitsubishi, Omron, Automation Direct etc).
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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OPC Knowledge Base is from OPC foundation.
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