I have a project to upgrade a centrifuge used to separate solids off of a slurry in a batch chemical plant. This is an old unit with an old VFD that regulates the speed of the bowl and relay logic to control things like the feed valves and oxygen analyzer. We need to replace the VFD so I was also going to add a small PLC to perform the simple relay logic plus add some functionality. I was looking at the DriveLogix system as a possibility since it appeares to encorporate a PLC with a drive. It looks like this system was designed for motion systems but I think it would work for this application. Any comments or experience with similar projects?