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I'm going to add to this, In my experience, Profibus on AC450 is not very reliable. If you dont already have profibus, I do not recomend adding it to an AC450.
( Profibus is of course otherwise an excellent bus system )
I have to both agree and disagree. It can be very reliable, (with the exception of early versions) but implementation requires a good understanding of the limitations. This is, in my experience, the most common problem. It is not a job for the unexperienced engineer.