> For the complete documentation index, see [llms.txt](https://infosys.selmotech.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://infosys.selmotech.com/selmo-solution/selmo-solution-en/selmo-how-it-works/selmo-training/chapter-2-the-architecture-of-the-selmo-system/2.8-summary-of-the-architecture-concept.md).

# 2.8 Summary of the architecture concept

Selmo separates the machine behavior into **two clear levels**:

1. The **switching mechanism** controls the temporal and logical sequence.\
   It knows *when* that something is allowed to happen.
2. The **zones** describe the physical or logical actions.\
   They know *what* that something should happen and *when* that it is completed.

Between the two there is a clear, symmetrical connection:\
action and reaction, cause and effect.

This architecture makes it possible to model any machine – no matter how complex – in a standardized, logically verifiable structure.\
This is the core of the Selmo principle:\
**Making complexity manageable through clarity.**

***

#### → Next step

In the following Chapter 3 we deepen this architecture by examining the **standard functions** of the system – the **PairCheck**, the **MXIC logic** and the **diagnostic mechanisms** in the HMI – and show how they create safety, transparency and efficiency in practice.


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