ISA95 Levels for Enterprise Integration
Level 0The physical process Defines the actual physical processes.
Level 1Intelligent devices Sensing and manipulating the physical processes. Process sensors, analyzers, actuators and related instrumentation.
Level 2Control 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 3Manufacturing 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 4Business 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.
