{"id":"mes","model_id":"MES","name":"Manufacturing Execution System (MES)","summary":"A manufacturing execution system is the Level 3 layer in the ISA-95 model, where it manages manufacturing operations. It sits between the Level 2 monitoring and supervisory control devices, such as PLCs and DCSs, and the Level 4 business planning and logistics systems, such as ERP. ISA-95 primarily defines the interface between levels 3 and 4.","study_notes":["ISA-95 is also published as ANSI/ISA-95 and adopted as IEC 62264.","The ISA-95 model has five levels, 0 to 4, and is based on the Purdue Reference Model for computer-integrated manufacturing.","Level 0 covers the physical production processes: machinery and other assets in the field or on the floor.","Level 1 covers sensors, smart devices and valves that sense or affect production.","Level 2 covers monitoring and supervisory control, including programmable logic controllers (PLCs) and distributed control systems (DCSs).","Level 3 also includes supervisory control and data acquisition (SCADA) systems alongside MES.","Level 4 covers business planning and logistics activities, including enterprise resource planning (ERP) systems.","ISA-95 was established in the mid-1990s and is technology-agnostic, prioritising activities rather than technologies.","The ISA95 committee oversees creation of the standards, aiming to define an abstract model of the enterprise and common terminology."],"safety_notes":[],"sources":[{"url":"https://csrc.nist.gov/glossary/term/manufacturing_execution_system","title":"Manufacturing Execution System (MES) - Glossary | CSRC","accessed":"2026-10-25"},{"url":"https://www.isa.org/standards-and-publications/isa-standards/isa-95-standard","title":"ISA-95 Standard: Enterprise-Control System Integration","accessed":"2026-10-25"}],"verification":{"status":"source_checked","checked_at":"2026-10-25","values":2,"method":"llm_source_check"},"updated_at":"2026-10-25","type":"operational","spec":{"kind":"system","origin":"ISA-95 (ANSI/ISA-95, IEC 62264), Level 3 of the five-level model","related":[]},"url":"https://machineschema.com/operational/mes","license":"https://creativecommons.org/licenses/by/4.0/"}