Structure of the MFS 
In the MFS, a conveyor system is mapped via the following components:
● PLC
The MFS controls the flow of materials within a plant by means of warehouse tasks at one or more PLCs. The PLC is linked to the MFS through one or more communication channels. An EWM warehouse task is subdivided into individual stages within the material flow. The start and end points of these stages are termed communication points. The telegram communication between the MFS and the PLC takes place there. The PLC regulates the necessary steps between two communication points itself.
You set up communication points only at those locations at which decisions are necessary from the subordinate view, that is, which cannot or should not be made by the PLC itself.
The connection between two communication points is called the conveyor segment. If a vehicle whose movements are to be controlled by EWM is used for transportation from communication point to communication point or from/to storage bins, it is mapped in the MFS as a resource. For stacker cranes, the MFS contains a strategy for reducing the empty traveling path (Interleaving).