Basic Programming questions

[rootboy]

I can count the number of times I needed pseudo random numbers on a real machine on one finger.

How about a carwash with pumps and pressure signals and lights and motors.

That's one more finger than I can come up with...

Which finger, by the way?

 

[rootboy]

Hello Doug-p Sir,
sir can u provide some diagram plz so that it is easy to understand and what is round robin fasion....

Regards
Ankit Chaurasia

Here's where you can find several examples:

http://www.plcs.net/downloads/index.php?direction=0&order=&directory=Allen_Bradley