Here are some of the Ladder Logic programs I developed for PLC. I am very interested in PLCs used for Industrial automation. I did a three months diploma in Automation and PLC from ACS, Pune. Most of the following examples contain the problem as flash animation. Now, that Adobe Flash animation can't be played by any browser, due to the updated security policies, you can download the files directly to your PC and play them using the Legacy flash player tool (which can also be downloaded from this page). Some of the following articles contain the ladder logic solution, while the rest only contain the problem/flash animation.
Download all the PLC examples from this link: All PLC Example Animations