Doubts in Graph 7 program

hello!

I'm Starting made programs in graph 7. Always i use ladder or scl to madeprograms at all. So i'm doing asimple sequence to start and stop a group ofmotors

My question, i think are simple,i use tensteps , five to start and five to stop, and one of these steps, when stays stopped, keep running a time, waiting for a signal to start a sequence ofstops.my doubtare about this time, if nothing happends, this time can made a error on PLC or stops the funcion of sequencer ?

I try to find anything about this, or about graph 7 programs, is anybody have any examples or some literature to help me, i thank you

Thanks, and sorry my bad english!