Model-in-the-Loop (MiL)

Model-in-the-Loop Simulation with ISG-virtuos

With our simulation platform ISG-virtuos, it is already possible to build MiL scenarios with borad means in order to validate process concepts of your machines and plants already in an early phase without a connected controller. For this purpose, the control logic is simulated in ISG-virtuos with the help of our logic libraries, lookup tables, state graphs or manual control elements of the individual components in order to be able to perform initial tests.

Typical use cases are:

  •     Reachability studies of robot systems
  •     Collision checks
  •     First tests of the material flow
  •     Verification of the logical production flow of a plant
  •     Illustration of a plant in distribution

Setup and use of a virtual test setup

Source: VDMA Guide VIBN

The VIBN requires executable simulation models of a component, machine or plant. The simulation models represent the following interrelationships, among others:

  •     Process logic
  •     Kinematics
  •     Material flow
  •     Physical effects
  •     Seonsors and actuators
  •     (Bus) communication

The control system is not integrated into the simulation model, but linked to the simulation. The virtual test setup, i.e. the linking of the simulation model with the control system, is called an X-in-the-loop system (XiL system). With the use of XiL systems, the following advantages are achieved compared to a real test setup:

  •     Lower costs during setup
  •     Less effort for continuous reconfiguration
  •     No use of physical resources (e.g. assembly or hall space)
  •     No wear and tear and no damage to operating equipment

The manifestations of XiL are distinguished on the basis of the type of control in:

  •     Model-in-the-loop (MiL): the control software is mapped in a model language.
  •     Software-in-the-loop (SiL): the control software runs in an emulation.
  •     Hardware-in-the-loop (HiL): the control software runs on the real hardware of the control system.
Quelle: VDMA Leitfaden VIBN