Embedding the Selmo-PTF into the overall project workflow

1. Basic idea

The Selmo-PTF (Process – Technology – Function) is the first and binding phase of every machine or plant project, where the specification or the concept is created. It is carried out before

• mechanical, electrical and software design and defines:

• the problem (what should be achieved?)

• the process (how does the sequence run physically and logically?)

• the technology (which means, components, interfaces are used?)

the functions (how is the behavior formally represented and verified?) The PTF is therefore theformal problem description and solution definition from which all other engineering disciplines derive their work. It stands on the same level as and mechanical drawingelectrical schematic , but forms the digital behavior description Process model.

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– the

2. Position in the project lifecycle 
   ↓
Customer inquiry
   ↓
Requirements analysis (Requirements)
   ↓
→ PTF process (Process – Technology – Function)
   ↓
Mechanical & electrical design
   ↓
Software development (Selmo modeling)
   ↓
Integration & commissioning
   ↓
Validation & CE documentation

Handover to operations & service

• The PTF forms the 🔹 Classification:.

• Transition phase between customer and engineering All requirements (functional, safety-related, economic) areverified here

• before anything is designed or programmed. Changes are.

cheapest and least risky in this phase

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Principle:

1. Errors detected in the PTF cost hours. Errors that only appear in the code cost weeks. 3. Objective of the early PTF phase

2. Understand the problem before solutions are created. – Focus on process understanding and customer benefit.

3. Establish engineering conformity. – Alignment of all disciplines to common standards.

4. Ensure Selmo conformity. – Only deterministic, verifiable process models are accepted.

5. Identify and assess risks. – Early risk assessment (technical, organizational, economic).

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Create traceability.

– Seamless documentation from requirement to code.	4. Integration into the engineering process	Engineering phase
Role of the PTF	Result / benefit	Pre-sales / proposal
Clarifies the process goal with the customer, provides reliable data for proposal & effort estimation	Better costing, clear expectations	Requirements engineering
Formulates the problem in PTF structure (process, technology, function)	Unambiguous, verifiable requirements	Mechanical / electrical design
Uses PTF to determine the required components & signal structure	Avoidance of design errors	Software / automation
Quality / Safety / CE	Creates Selmo process model directly from PTF output	Complete traceability, no room for interpretation
Operations / Service	Assesses PTF risks & standards compliance	Demonstrable safety & documentation

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Uses PTF documentation for training & diagnosis

Transparent operation & maintenance 5. Early verifiability and changeability Since the PTF

• is created before design the following can be done:

• Process sequences can still be changed and before they are implemented expensively, Non-Selmo-compliant technologies can be identified

• and adapted

• Functions can be standardized and made reusable,

• and Costs and complexities can be reduced,

Risks are proactively assessed instead of being treated reactively.→ Thus the PTF becomes the

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strategic filter

: Only what is methodical, normative and technically consistent may go into implementation. 6. PTF as a formal description language of digital engineering

Discipline	Formal language	With the Selmo method applies:	Goal
mechanics	As the drawing describes the mechanics, the PTF describes the code.	Evidence	CAD / technical drawing
Electrical	Bill of materials, dimensions, tolerances	Form and function	Circuit diagram / E-plan
Automation / Software	Wiring, circuit, protection circuits	Energy and signal flow	Selmo-PTF / process model

Process, logic, monitoring Behavior and control→ All three disciplines are

• Documentation

• equivalent

• , follow the same basic principles:

• Traceability

Verifiability MVO 2027 formal correctness Thus Selmo meets the demands of

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and other regulations for

"complete documentation, formal verifiability and deterministic behavior".

• 7. Dealing with deviations and risks . During the PTF:Non-conforming requirements or technologies are not discarded.

• but

  • transparently documented and assessed Each deviation receives: a

  • risk rating (critical / moderate / acceptable)

  • risk rating a

responsible person a planned action path→ This creates a

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controlled risk landscape

that can be actively managed. → Changes in the PTF are traceable and verifiable – no "telephone-game knowledge" in the project.	Benefit
8. Benefits of early integration	Dimension
Technical	Early detection of conflicts between mechanics, electrical and software
Organizational	Unified language, clear responsibilities
Economic	Lower change and commissioning costs
Qualitative	Higher stability, lower failure risks

Legal / normative

• Demonstrable conformity (MVO 2027, CE, ISO 12100 etc.)

• The PTF process serves to:

• Understand the customer's problem exactly,

• Describe the process completely,

• Check the technologies used for Selmo conformity,

Define the functions in a documented and verifiable way,

9. Conclusion

The Detect risks, deviations and regulatory requirements early. → Result: A complete, verifiable machine model – as a basis for mechanics, electrical and software. Selmo-PTF.

is the new starting point of every project. It replaces incomplete specifications with a formal, verifiable and deterministic description

Even before mechanics are drawn or circuit diagrams are created, it is clear what the machine should do, with what it does it and how it behaves. Thus the PTF becomes the engineering standard– for the