PLC Training: Some interesting exercises

I found some interesting exercises about plc programming that cover almost all the topics that a programmer should know.
The document is mainly thought for Allen Bradley plcs users, but it can be useful also for others.
The exercises are:
1) Using simple relays logic to control a motor
2) Using relays logic to control simple sequences
3) Using Timers, Retentive Timers and Counters
4) Using relays logic + everything saw before to control a batch mixing system
5) Using shift registers to determine the position of a bottle in a filling plant
6) Using various modules to control an elevator system.

The pdf  was found on http://thelearningpit.com/lp/logixpro.html, they also sells some kind of graphical simulation to run the plants if you're interested.
 I reccomend to try logixpro simulator (15 days trial) because it can really improve your ladder code with just your time.
You can download the exercise file directly from learning pit website or from here:
http://www.megaupload.com/?d=PIWQA7AS

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