While the control logic determines the Sequence logic determines,
the system layer describes the behavior of the individual signals.
Here all physical and logical interfaces are organized in the form of zones organized.
A zone is a standardized functional block,
that combines action and reaction.
It ensures that every action receives a defined feedback.
The zone types
IN zone
Receives a signal from the environment.
Example: a start button, a sensor, an enable.
Supplies TRUE/FALSE to the control logic.
OUT zone
Controls a signal outward.
Example: a lamp, a valve or a driver for a display.
IN_OUT zone
Combines output and feedback.
Typical example: a cylinder with end-position sensors.
An action (switching a valve) generates a reaction (sensor reports reached).
MEM zone
Purely logical zone.
Stores states or parameters, e.g. “part count = 5” or “mode = auto”.
