FourFront

Hello, I was wondering what the viability and ease of upgrading an AB processor to the next more "powerful" version. Is it a simple plug and play task, or does it require any significant modification to your project to change?   My current project is critically faulting the processor in periods of heavy use so we are considering trying the upgrade route.    On a side note, when viewing the  task monitor pie chart in Logix Designer. What does the "comms" portion refer to?