I always have to bite my tongue, when someone say's "I want to get into PLC's and automation" Number one as alluded to in other posts, this is one of those jobs, that require experience to get, and it can be difficult to get a look at PLC's without experience... You need to be patient and willing to prove yourself time and time again. Second when working in process control, it is very much a multi-disciplined field. One needs to understand programming logic, networking, mechanics, physics, troubleshooting, and be able to work with all of these at the same time.... One needs to be able to think beyond the books and charts, and be willing to get your hands dirty. This applies to the third thing, you won't be trained on a lot of what you work on. I have often said, that I am good at not having a clue what I am doing, and still getting the job done when I'm through. You need to take what you know, and apply it to what you don't and figure it out.
With all this, I agree with TW... Peter Nachtwey is a very intelligent man, and I'm sure that he would be very good in most anything he set out to do. But out of 100 Peter Nachtwey's some would not be as successful as he is now setting out only in automation programming. Some may end up very valued in a maintenance job but not making much money, other's may never find the chance.
I don't mean to discourage you, as you sound like you are well on the path that many of us have taken. But realize that you need to position yourself where you can get opportunities, and then have the patience to show yourself capable. This might be as a maintenance tech, or a panelbuilder, and most likely start out with an opportunities to simply troubleshoot PLC's. My points above are one of the main reasons, that few simply come out of school and quickly get their hands on automation. While education is certainly necessary I think that the many skills I cited are something one is born with, rather than taught.
-Brian