> 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-how-it-works/selmo-training/chapter-2-the-architecture-of-the-selmo-system/2.4-the-operands-the-behavior-of-the-zones.md).

# 2.4 The operands – the behavior of the zones

Each zone knows what it should do in each state because its behavior is defined over **operand** The operant is the zone's “behavior nameplate” in the respective state.

* **S (Sequence Check)**\
  The zone is supposed to do something and wait for feedback. *Cylinder 1 extends – wait for front sensor.*\
  As long as the feedback is pending, the switching mechanism blocks the state change.
* **I (Interlock)**\
  The zone monitors a condition. If it is violated, it immediately triggers an error. *Cylinder 1 must be retracted – if not, interlock.*
* **M (Monitoring)**\
  The zone passively observes the state. Errors are reported, but the sequence continues.
* **0 (Don’t Care)**\
  The zone is meaningless in this state. No action, no monitoring.

These operants are entered in the **bit-control grid** entered:\
Each zone is a column, each state a row, each cell an operant.\
This creates a complete map of the machine's behavior.

<figure><img src="/files/fbd0e143e184304b1f92b27ebeaed096a2f4e16c" alt=""><figcaption></figcaption></figure>


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