While Iteration block

Hi all,please i am trying to send a sinewave via tcp/ip to labview but i am having a problem.I think because its not running continuously labview cant connect with it and receive the data simulink is sending.I want to use the while iteration block to make it run continuously but i cant configure it to do so.So i have the sinewave block,the tcp/ip send block a scope(to see that what i am sending is what i will receive in labview).Please can anyone help give me a step by step approach if possible on how i can make this run continuously with the while iteration block?your assistance is appreciated.Thanks