You need to understand that there are about 5 ways to program a "Modicon", Ladder logic , IEC, etc, etc, using several different programs: Concept, ProWORX, etc, etc. The world is broken up into groups who swear by each method/program. As you search for info your choice of which ever method/program should guide your hunt.
Here's the scoop.
There are a few companies who make training movies\material where you can buy this info. About a thousand bucks! I would imagine this stuff is pretty useful.
Snider Electric (owner of Square D, [maker of Modicon]), gives classes on the subject. Two day classes cost about $900 three day courses cost about $1200. They are given around the country regularly.
I suspect if you pay good attention you could go a long ways down your Modicon knowledge road via these classes.
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More hideously, they have a technical data web site that has hundreds of documents that explain probably most stuff including basic setup and use of each type of PLC and each of the umpteen different languages available for programming them, for example "Modicon 984 Latter Logic".
You have to dig a little and the web site, in a nutshell, SUCKS, but you can probably find what you need there.
There is a catch however! To get to that website you need a service contract! If you buy any of their software you generally get a one year service contract with it and so automatically get to use that knowledge base. If you haven't bought any software you have to purchase some sort of service contract. I would assume that there is a cheap one for just the data base. They ARE very helpful, and friendly, so you shouldn't hesitate to call and ask about what it takes to get onto the "eclipse site".
Controlnot,
Itsmoked is correct about the different types of languages that can be utilized.
From what you are asking though, I think that you are most interested in ladder logic. I worked for Modicon for almost 20 years and can give you a slew of recommendations.
