Wind control user defined model

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I have developed a UDM for electrical control model and auxiliary control model. I want to integrate it with REGCA1(Generator). In my electrical control model, I can get Ip and Iq. Then I want to use WIPCMD and WIQCMD which is the input of REGCA1.

In my electrical control model, I write WIPCMD(MC)= WIQCMD(MC)=. But when I use my UDM, call values are zero. Could someone help me?

And I also have questions.I don't know how to get wind machine index and pass WIPCMD and WIQCMD.