Using Allen Bradley laboratory ladder logic software program, develop a ladder logic program to turn on a flashing light for the first 15 seconds after a PLC unit is turned on. The light should flash for half a second ON and half a second OFF.

The program should be executed three times with a wait state of 5 seconds between operations and terminate. This means your light flashes for 15 seconds, waits for 5 seconds, runs for another 15 seconds, waits for 5 seconds, and runs for a final 15 seconds before terminating.