optiSLang interfaces and customizations 2025 R2

Functional Mock-up Interface

Last update: 22.06.2026

The Functional Mock-Up Interface (FMI) enables suppliers to distribute models from various domains (http://fmi-standard.org/). The unified FMI standard allows you to combine models in a single simulation environment. You can simplify your design process by using combined models, called Functional Mock-Up Units (FMU), instead of relying on proprietary interfaces. An FMU is a single file that can be imported and then used as a component in any simulation tool.

You can export a Metamodel of Optimal Prognosis (MOP) or an Adaptive Metamodel of Optimal Prognosis (AMOP) as an FMU. Exporting is supported only for the following metamodels:

  • Polynomial
  • Kriging
  • Moving least squares

To export as an FMU:

  1. Open the Functional Mock-up Unit dialog box.

    • After the calculation has finished, right-click the MOP or AMOP node and select Export FMU from the context menu.
    • Import a monitoring database file that has already been saved into an MOP Solver node, then right-click the node and select Export FMU from the context menu.
    • In the Postprocessing window, select File > Export FMU.

  2. Set the following export options:

    Field Description
    Output File Path to a text file the log will be written to.
    Name Mandatory model name.
    Description Short description of the model.
    Author Names of the model's authors.
    Extrapolation - Never: Does not create an output slot and prevents calculation of the selected field.
    - Toggle by Pin: Creates an additional input slot that is used during simulation runtime to enable or disable the calculation of the selected field dynamically.
    - Always: Creates an output slot and allows calculation of the selected field.
    Criteria - Never: Does not create an output slot and prevents calculation of the selected field.
    - Toggle by Pin: Creates an additional input slot that is used during simulation runtime to enable or disable the calculation of the selected field dynamically.
    - Always: Creates an output slot and allows calculation of the selected field.
    Gradients - Never: Does not create an output slot and prevents calculation of the selected field.
    - Toggle by Pin: Creates an additional input slot that is used during simulation runtime to enable or disable the calculation of the selected field dynamically.
    - Always: Creates an output slot and allows calculation of the selected field.
    Densities - Never: Does not create an output slot and prevents calculation of the selected field.
    - Toggle by Pin: Creates an additional input slot that is used during simulation runtime to enable or disable the calculation of the selected field dynamically.
    - Always: Creates an output slot and allows calculation of the selected field.
    Errors - Never: Does not create an output slot and prevents calculation of the selected field.
    - Toggle by Pin: Creates an additional input slot that is used during simulation runtime to enable or disable the calculation of the selected field dynamically.
    - Always: Creates an output slot and allows calculation of the selected field.
    Enable File Logging Select the check box to enable logging of parameter and response values for each MOP Solver call. The logfile's path is %TEMP%\mopsolver_fmu.log.

  3. Click Start.

The resulting FMU implements Functional Mock-Up Interface for Model Exchange 1.0. Usage is currently limited to 64 bit Windows and Linux systems.

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