6.1 Why safety is a structural topic

In many traditional control systems, safety is implemented through additional program parts: – emergency stop checks, – interlocks, – time-based monitoring.

This leads to a patchwork of logic and special cases. Selmo pursues a different approach: Safety is not an add-on, it is an inherent result of the formal structure.

As soon as the user defines zones, states and operands, all safety rules are generated automatically: – every action has feedback, – every zone knows when it is active, – the switching logic detects every contradiction.

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