Don,
I would be careful.
As Dan mentioned, check your local community colleges and trade schools. Not all will offer the same level of teaching.
The important thing is for your son to gain an understanding of the fundamentals first, and not emphasize the manufacturer. Whether the programming is ladder logic, function block, etc... He should first have a solid foundation.
Every PLC manufacturer does their programming differently. However, the fundamentals are same. A timer is still a timer. He should know how to use a timer, where and when to use a timer.
Phil has some good tutorials here. Click on the "Learn PLCs" icon at the top of the page. Some of them are animated.
Focus on the specific controllers afterwards.
Be careful of places like ITT. When we hired our tech at Entertron back in 2000, he came from ITT. His experience with PLCs at that time was limited to keying a ladder program into an Allen Bradley trainer. There was very little teaching done on PLC programming. Whether their program has changed since, I can't answer, however be careful, because they are very expensive. FYI, his strength was computers, which is why we hired him. We taught him what he needed to know with regards to PLCs in general and Entertron specifically.
If your son wants some software to play with, he can download the Entertron software from this link. Send me an email and I will send you the password to unlock it.
http://www.eternity-sales.com/Entertron/software.htm
There are programming examples and a built in simulator that can be used to test the logic.
If you have the time, you may be able to teach him what you know as well. You have experience across several different PLC platforms. This is valuable knowledge as well.
I believe there are still companies that do apprenticeships, so learning on the job may be possible. Also, if he gets hired by a company that offers to pay for additional education may also be a possibility. Keep in mind if a company invests in your son's education, he will have to commit to a minumum number of years at the company.
Whether your son goes the school route or the work route, there are options available.
Hope this helps.
Shalom and God Bless,