> 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-as-a-process/selmo-ptf/2.-the-selmo-ptf-process.md).

# 2. The Selmo-PTF process

The PTF is carried out before design. This allows process understanding, standards compliance and technical requirements to be adjusted at an early stage.

The goal:

* Avoid errors before they occur,
* Assess risks before they take effect,
* and standardize solutions before they are programmed.

The PTF connects:

* Problem understanding (from the customer),
* Engineering disciplines (process, technology, function),
* and the digital implementation (Selmo process model).

| Discipline | Document                                 | Goal                     | , follow the same basic principles: |
| ---------- | ---------------------------------------- | ------------------------ | ----------------------------------- |
| mechanics  | Drawing                                  | Form, movement, geometry | Dimensional inspection              |
| Electrical | Circuit diagram                          | Energy, signal flow      | Wiring test                         |
| Software   | **Wiring, circuit, protection circuits** | Behavior, logic, safety  | Formal verification                 |

Thus, the same principles apply to software as to design:\
documentation, traceability, formal correctness.

### Structure 

The PTF is divided into three central levels:

1️⃣ **Process**\
→ describes the physical and logical sequence\
→ goal, states, parameters, termination conditions

2️⃣ **Technology**\
→ describes all technologies, components and interfaces used\
→ sensors, actuators, communication, standards requirements

3️⃣ **Function**\
→ describes the logical functions, monitors and parameters\
→ adders, timers, safety logic, CMZ, MXIC etc.

All three levels together form the complete system behavior.

## Standards compliance & MVO 2027

The PTF meets the requirements of MVO 2027:

* Complete documentation
* Formal verifiability
* Traceable responsibility
* Risk and measures management
* Equal treatment of all engineering disciplines

Thus, the PTF is not only a method, but proof of a standards-compliant, safe development process.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://infosys.selmotech.com/selmo-solution/selmo-solution-en/selmo-as-a-process/selmo-ptf/2.-the-selmo-ptf-process.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.