> 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-academy-training-manual-basics-and-quick-start/module-4-the-zone-logic.md).

# Module 4 – The zone logic

#### **Learning objective**

Understand how zones determine behavior and how operators S, I, M, 0 work.

#### **Explanation**

Zones are the link between logic and reality.\
Each zone reacts to the state with an operator:

* S: Execute action, wait for feedback.
* I: Monitor safety.
* M: Observe diagnostics.
* 0: Ignore.

#### **Task**

Take a cylinder with two end-position sensors.\
Define which operators it has in the following states:

1. Home,
2. Extend,
3. Retract.\
   Explain why.


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