Virtual commissioning is used to test control code deployed on Programmable Logical Controllers. Simulation models of a plant are the basis for simulation approaches covering virtual commissioning. However, it is often unclear what granularity these simulation models should have and how standardized levels of detail and particular model types should be defined. The approach presented herein identifies appropriate levels of detail and model types based on a hierarchical perception of automated manufacturing plants. The aim of this contribution is to systematize modelling approaches, especially the automatic generation of manufacturing plants' models.