How to let the DDE correct?

Dear Community Members,
In my model , the Dynamic Data Exchange was used to communicate with Excel, I had built this model in 5.1.2 and the codes was in ‘User Events’ in ‘tools’ menu and the communication was correct, but I want the communication only created one time when the model begin. But now it was triggered again and again. Who can tell me why? How can I let it correct?
Thanks.

My description was maybe not clearly. I want to read the processtime from Excel and store the data in global table ‘processtime’, this operation only need one time. Then I wrote the DDE codes in User Events. But when the model running, the DDE ran again and again when the item exit the source, enter the queue, exit the queue……, even I didn’t select ‘Execute event on reset only’ in User Events. I can’t understand this and find out the solution. Who can tell me? Thanks.

The problem disappears if you remove the user event completely and then define the import in the Excel Auto (button) as part of a multi-table import. After that just call the function excelmultitableimport(), which you can do on reset or, if the data isn't going to change, when the model loads (see Model Triggers).

Jason, thanks a lot! I will try your suggestion. But the logics in Flexsim are inexplicable sometimes. In my model, the idea using User Events may be a wrong selection? I don’t know.