I've added two 5500PS units to a network and they work without a problem. The only issue is that although they show up in toolkit as existing in the database, when the network is scanned they do not show up in the network even though they are connected, running and providing power (I know this because they are the only source of power on the network). Any idea why they don't show in the 'Units on Network' section of toolkit even though they are functioning? Thanks, Andrew