FBus (Fport 2) 2 ports ? master vs slave?

Hello. I use FrSky stuff with Ardupilot. There is FBus support, but can I use 2 ports together (master vs slave?) I need connection between receiver and Ardupilot and then another Fbus connection between Ardupilot and sensors. I tried, I can hook everything to one single Fbus, but I use RB devices to servo connection, so I need received channels from receiver to controller and then controller output channels from controller to RB.
Thank you