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Search for rslogix500 product profile at the literature library for the latest document, the last page of the document outlines the differences.
See link http://literature.rockwellautomation.com/idc/groups/literature/documents/pp/lg500-pp001_-en-e.pdf
See link http://literature.rockwellautomation.com/idc/groups/literature/documents/pp/lg500-pp001_-en-e.pdf