> 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-structure-and-standard/selmo-technical-standard-and-structure/parameter-types.md).

# Parameter types

#### 2.4 Types of parameters and usage

Parameters extend the model with data values (not just binary states).

| direction | Meaning                                                 |
| --------- | ------------------------------------------------------- |
| `IN`      | user-adjustable (e.g. cycle time)                       |
| `OUT`     | measured or determined by the system (e.g. actual time) |
| `INOUT`   | combinable (e.g. teachable values)                      |

Parameters are used for:

* sequence control (e.g. timer state)
* HMI display and input
* export via OPC UA / SCADA / control system

This structure makes Selmo clear, consistent, scalable – and it is fully verifiable and documentable.


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