Hello, I have a PP836 who is connected to a AC800M by Profibus CI854. The initial panels installed on 2006 and they are Rev3 and they are working good. The problem is we bought a new unit for spare but the version is Rev4. When we install the CB801 communication module (taken form old panel) the Panel boot stop when it start Profibus Drivers. The CB801 we are using are PR:A. Anybody have a compatibility table between PP836 and CB801 Profibus module? Which can be the problem?