General question about absolute multi-turn encoders

I have a question regarding use of multi-turn biss-c type encoders with IONI drive.

Once an encoder is set up and the motor powered up etc, will the motor report the correct absolute position, no matter at which position it was shut down? (I mean including number of turns from a limit.)

What form is the position value expressed in?

The reason for my questions is I’d like to use the encoder as the principle motor feedback device, but also be able to interrogate it so my control software knows where the motor is on a short track at any moment without having to run a homing routine.

I may use step pulse control for the motor, but still need to obtain the absolute position to confirm and for starting up. I expect to use simple motion for that purpose.