Well I will tell you alittle that I know about both of them. I had a similar application as you, but mine involved Danfoss' 2800 series book style drives and a SLC 5/05. I installed 80 of these drives originally using a SLC 5/04 and a basic module to talk the "FC" Danfoss protocol to all of the drives on the "FC" network. It was alittle time consuming, but I finally got it figured out and the ladder was quit amazing, but needless to say I got it working and the nice thing about it is they are all on one network with some repeaters in their. So my next project was to add 150 MORE drives. So after looking at all my options Danfoss came to us and said that they have this ethernet BOX that will work with a ethernet network. So after looking into it it came out that a AB SLC5/05 will not talk true ethernet/IP. They wanted me to upgrade to the logix processors that talk true CIP instructions or something like that. Well that was totally out of the question so we scraped all of that and went to a Modbus network with Yaskawa drives. Hope that answers some of your questions.