Level 0 — The physical process — Defines the actual physical processes.
Level 1 — Intelligent devices — Sensing and manipulating the physical processes. Process *sensors,
analyzers, actuators and related instrumentation.
Level 2 — Industrial Control systems — Supervising, monitoring
and controlling the physical processes. Real-time
controls and software; DCS, human-machine
interface (HMI); supervisory and data acquisition
(SCADA) software.
Level 3 — Manufacturing operations systems —
Managing production work flow to produce the desired
products.Batch management; manufacturing
execution/operations management systems
(MES/MOMS); laboratory, maintenance and plant
performance management systems; data historians
and related middleware. Time frame: shifts, hours,
minutes, seconds.
Level 4 — Business logistics systems — Managing the
business-related activities of the manufacturing
operation. ERP is the primary system; establishes the
basic plant production schedule, material use, shipping
and inventory levels. Time frame: months, weeks, days,
shifts.