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I would like implement a HSM in 61131-3. Doing some reading I understand that HSM's are a sort of subset of pushdown automata?

Most of the examples from other languages are using pointers and references, which I would like to avoid. Is it feasible to implement a HSM without using pointers or references?

I guess I need an event stack and a stack for the nesting of the stack?

Thanks

krakers
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If it's supported by your programing software SFC (sequential function chart) might be what your looking for. SFC is a graphical programing language based on actions and transitions. It avoids pointers and is one of the five IEC 61131-3 languages.

mike_yung
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