If you hand fly the climb, for example, and you want F/D assistance, you could select "Vertical Speed" mode and enter whatever rate you wish to climb at, say 1500 feet per minute, and the F/D command bars would show you the pitch angle on the Attitude Indicator in order to maintain that. Or if you want to climb at a specific airspeed, you could select "Indicated Airspeed" mode and the command bars would give you the pitch attitude to maintain that. But the F/D will not protect you from a stall, if the airplane is not able to maintain proper airspeed at the selected 1500 feet per minute climb rate. Likewise, the F/D commands will not protect you from a stall during the climb if you follow a specific vertical speed command that is not commensurate with the airplane's weight at a given altitude.
