Functional Mockup Unit. A model is independent of the target simulator because it does not use a simulator specific header file as in other approaches. The vision of fmi is to support this approach.

Fmu stands for functional mockup unit. Popular lists for the abbreviation. Functional mock up unit a file with extension fmu that contains a simulation model that adheres to the fmi standard.
When you build a model that includes fmu blocks you must compile the fmu source code by using the qnx neutrino compiler qcc or q.
Latest versions of the standard are here. Co simulation integrate fmus that implement a functional mock up interface fmi co simulation interface. Bikesim carsim and trucksim can automatically generate a vs fmu as a co simulation slave for the following options. The block automatically selects an fmu mode based on the existing fmu you want to import.