ENGINEERING INSIGHT

PackML-Oriented PLC Architecture Without Losing Debuggability

PackML gives machines a common operational vocabulary, but implementation still needs clear ownership across unit, subsystem and component levels.

One owner for each decision

Define which layer owns each request and let lower layers enforce device-level interlocks.

CASE-based sequences

Explicit state machines make active states, transitions and timeout conditions visible online.

Manual control without bypassing safety

Manual control may bypass appropriate automatic constraints, while safety and device faults remain authoritative.

Stopping is a sequence

Stopping should explicitly clear requests, close paths and wait for required mechanical actions.