Selmo separates the machine behavior into two clear levels:
The switching mechanism controls the temporal and logical sequence.
It knows when that something is allowed to happen.
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.
