How do you implement PackML state machine for packaging equipment?

PackML (ISA-TR88.00.02) implementation: define state model (Execute, Idle, Stopped, Held, Aborted, etc. with transitions), implement mode manager (Production, Maintenance, Manual), develop unit control (state machine PLC code), configure PackML tags (standard interface - Admin, Status, Command). HMI: PackML faceplate showing current state, mode, and command buttons. Integration: standardized interface enables line coordination, OEE calculation using state data. Benefits: consistent operator experience, simplified line integration, meaningful KPIs. Test all state transitions including fault scenarios. Validate against PackML certification requirements if needed.