Exchanging data via DDE

Citect SCADA runtime can exchange data as a DDE server or a DDE Client.

Citect SCADA behaves as a DDE server when providing other applications with access to its data. When acting as a DDE server, Citect SCADA runtime can:

• Provide DDE access to the complete variable tag database automatically with no further setup necessary
• Provide access to selected variable values by posting select Citect SCADA data using DDE

Citect SCADA behaves as a DDE client when requesting other applications to provide access to their data. When acting as a DDE Client, Citect SCADA runtime can:

• Read data directly from another application
• Write data directly to another application

Note: You can also execute commands in another application from Citect SCADA with the DDEExec() function. Similarly, you can run Cicode functions from another application by passing the functions through that application's DDE Execute command.

See Also

Published June 2018