Finally, my career in industrial automation can help someone on the MMM forums, I thought this day would never come!
Questions you need to answer:
1.) What level of PLC skill do you desire?
A.) Basic understanding
B.) Ability to troubleshoot and make BASIC logic and parameter changes
C.) Full on PLC programming where you pull a new PLC from a box and integrate everything?
2.) How much time / resources are you wanting to throw at this?
A.) Some internet articles
B.) Classroom time
C.) Buying your own PLC to play with at home
3.) If you learn PLC skills and start making Basic changes, and something goes really really wrong, is assistance readily available to bail you out? (Shit happens with automation, the craziest shit just happens for no explainable reason....)
Just some things I wonder before making a suggestion. In general the information is readily available in scholarly form on the internet and in books. Depends on how much time you have. If You want to legitimately start making changes at your current job, I suggest seeing if your local Tech school has a few hands on classes.