Can I use the attached Interface module and AI module for extension of S7-1200 distributed IO? I see this Interfcae modules are meant for S7-300 ? 

Only this interface modules have 8channel AI thermocouple module. That's why selected this. Is it easy to integrate with S7-1200?

Any inputs will be greatly helpful.

So I can simply have this two modules for IO extension with Power supply module. Am I right?

If yes, thanks a lot for the information. It really helped.