FM RZL_SLEEP

I have a program which executes a functionality in a loop( repeatedly). After each loop I want the program to wait for some time( say 300 secs ). I found out two function modules to be used to make the program wait.

1) RZL_SLEEP

2) AM_PING_AND_WAIT

Is there any advantage in using one over the other. I could see that RZL_SLEEP calls some C functions. Any info on these funstion modules especially RZ_SLEEP would be great.What I am lookin at is how exactly RZL_SLEEP works.

Thanks & Regards

Jijilal