General information and guides can be found on the internet. Eg

http://en.wikipedia.org/wiki/CoDeSys

http://en.wikipedia.org/wiki/Controller%E2%80%93area_network

Also have a look at microcontroller manufacturer's websites for lots of good application notes and guides on the subject and use of the CAN bus.

A google search of "Codesys guide" produced a number of useful guides too, and training courses are also available on Codesys. I didn't see any "for dummies" guides on the above subjects, but you could try your local or online technical book store as there are plenty of books available on the subjects.

Sorry I haven't replied sooner, I have been out of town. Thank you for your response, you have given me a good starting point.