this is the elevator control system for 15 floor building with 4 elevators. it runs just like normal elevators system in our real world. My system should provide an outside panel for user to require the UP/DOWN at any floor and also an inside panel to allow user in the elevators to select which floor he head to. The system should move UP/DOWN and STOP at any floor according to boht outside and inside requests. If without response for a outside request within 3 minutes there would be an alarm . Also an administrator paned is needed to control the whole system to stop and restart. My system also need to simulate the movement of the 4 elevators. Is that clear ?