With this information it is hard do know what the problem is. More information like an image of the model would be good. And does the program crash? I could not figure what you mean by "ITS GETS HANGED". Also what do you mean by "IT IS LOOPING SYSTEM"? Simulink simulates not in a looping matter, just from 0 to x seconds.
But here are some hints for debugging:
- If it crashes try: 1) another simulation. 2) simplifying the model by commenting out certain parts and check if it works.
- Check if the model did run already. Sometimes it runs so fast, that you think it did not run. To do this use a scope on one of the signals, or enable logging. Then you can look at the graph.
- Restarting Matlab/Simulink could also help, but not something I would hope for
