text: <s>[INST] PowerFlex 700S Phase I versus Phase II control Summary: which should I choose for a new project? (if there is a choice)Hi, After doing a lot of reading and asking many questions here on this forum, I believe the PowerFlex 700S is the drive best suited for my particular web handling application in which I need two drives that will work on 208/240 VAC and that will allow me to configure them in a master/follower arrangement in which the follower drive will monitor feedback from two encoders (one on the follower motor and one on the master motor), and will allow me to control follower motor speed at a ratio of the master motor speed. As I have started to read the PF700S literature in an attempt to pick out the actual catalog numbers that I will want to buy, I see that the PF700S has (at least at one time), come with two varieties of control hardware - Phase I and Phase II. From what I can tell, Phase II seems to be newer and better, and I don't see any reason why I would want to consider Phase I for a brand new project. If anyone can tell me if my understanding of this is correct, or if I am missing something, I would greatly appreciate it. Thanks in advance, Paul [/INST] Paul, go here: http://raise.rockwellautomation.com/RAConfig/browsecatalog.asp?LID=ABStdProds,Encompass&onKil=http://www.ab.com/raise It's the on-line configurator for most of Rockwell's product line. Go to Drives AB, Architecture Drives, and select PF700S Work from top to bottom. You'll see that there is only phase-II available. Running through the configurator will quickly help you determine exactly what you need; the options self-limit so you do not create an impossible part number. \\n </s>