communication of abb plc with siemens on profibus
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I remember similar question from you few days back, regarding import of gsd file. I am not an expert with plc ac500, but have idea about profibus and as far as I know adding profibis DP/PA slave(client as it's mentioned in question) is same for all different type of slave. so if you have idea about import of gsd from previous question http://www402.abbext.com/How-import-gsd-file-q28971.aspx same you can apply here.
it's different case only if both the PLC's are master, you need to use dp to dp coupler and some ac500 experts can suggest you better option if that is the case.
I suggest to browse these two links where you can find lots of manuals/video's and information with basic's of plc ac500 (check downloads)
Hope these helps