AC500 CodeSys Timers not working

I made a logic in Codesys FBD with several timers for different motors. The timers in first 10 rungs of the POU are working, rest of the Timers arent working. I have checked decleration for all timers & found all to be same with different names. I used all TON timers. Then why only 10% of the timers are working & rest 90% are not working. Is there any way to get the rest of the timers working. I face alot of pressure at site. I will be grateful if anybody could help me As soon as possible. PM573-ETH AC500