View and Edit FMU

An FMU represents a dynamic system which is characterized by arrays of inputs (U), dynamic states (X), and outputs (Y). In addition, an FMU can contain Parameters that can be changed to vary the initial state of the model that the FMU represents.

Figure 1. FMU panel - Properties tab
The FMU panel Properties tab displays the following information:
Property Type Description
Filename File FMU file name with path.
FMU Type String Type of FMU.
  • Model Exchange


  • Co-simulation

If an FMU contains both types, this option is available for selection.

Number of states Integer Number of states within the FMU.
Number of inputs Integer Number of input channels the FMU is seeking.
Number of outputs Integer Number of output channels from the FMU.
Number of parameters Integer Number of parameters in the FMU.
Check FMU   Runs the FMU compliance checker to provide more information and verify the validity of the FMU. See Comments.
Reload FMU   The FMU is reloaded.

Click on Edit FMU... to view and edit Input, Output, Parameters and Settings.

The FMU dialog appears.

Figure 2. FMU dialog

This dialog has the following tabs:


The input tab lists all the input channels in the input array with their name and description.

Provide a solver expression under the Value column to each of the channels as input to the FMU. The value of this solver expression is computed by MotionSolve during simulation and communicated to the FMU at every time-step of the simulation.


This tab lists all the output channels in the output array from the FMU with their names and descriptions.


The parameters tab lists the parameters and initial conditions along with their default values in the FMU. Parameters are variables that are exposed by the FMU and can take a different value at the beginning of the simulation. Parameters can be of the type Real, Integer, Boolean or String.


The settings tab provides additional options:
Property Type Description
Error tolerance factor Real Applicable for FMU of type Model Exchange only. A scale factor that is multiplied to the displacement integration error tolerance define the integration error tolerance for the continuous states of the FMU.

Value > 0, Default: 1.0

Communication Interval Real Time interval that MotionSolve uses to communicate with the FMU.

Value > 0, Default: Maximum integration step size

Static Hold Boolean Applicable for FMU of type Model Exchange only.

Flag to hold the value of the FMU’s dynamic states constant during a static or quasi-static simulation.

Default: False
Use Address Boolean Turn this option ON if the FMU is run on a different machine. Default: OFF (FMU is executed on the same machine as MotionSolve).
IP Address String If Use Address is ON, provide the IP address of the machine where the FMU is executed.