ISA ISA-95

ISA-95 (also ANSI/ISA-95 or IEC 62264) is a set of standards for integrating enterprise logistics systems with manufacturing control systems. It organizes technology and business processes into five layers, defined by the activities taking place in each, and outlines how an enterprise can set up interfaces to communicate among those layers. The architecture is based on the Purdue Reference Model for computer-integrated manufacturing and is used to describe network segmentation in industrial control systems.

Source checked2/2 values · 2026-10-25Methodology

Specification

2 sources

Kind	methodology
Origin	Purdue Reference Model for computer-integrated manufacturing (CIM), published by ISA

Study notes

The ISA-95 model consists of five layers or levels, numbered 0 to 4.
Level 0: physical production processes; refers to machinery and other assets in the field or on the floor.
Level 1: sensing and manipulating the production process; refers to sensors, smart devices, valves and other devices that sense or affect production.
Level 2: monitoring and supervising control; refers to programmable logic controllers (PLCs), distributed control systems (DCSs) and other control devices.
Level 3: manufacturing operations management; refers to manufacturing execution systems (MES) and systems such as SCADA that manage manufacturing operations. The standard primarily deals with the interface between levels 3 and 4.
Level 4: business planning and logistics; covers all activities related to running a business, including enterprise resource planning (ERP) systems.
The standard is published in eight parts, covering models and terminology, objects and attributes, activity models of manufacturing operations management, business-to-manufacturing transactions, messaging and alias service models, and information exchange profiles.
Part 2 defines the interface between level 3 manufacturing systems and level 4 business systems; Part 5 and Part 6 define exchanges across levels 3 and 4 and within level 3.
The ISA95 committee oversees the standards, based upon the Purdue Reference Model for CIM (hierarchical form) as published by ISA.
The framework was established in the mid-1990s; its scope prioritizes activities, not technologies, so it is intended to be technology-agnostic.
The equipment hierarchy model can be applied across discrete, continuous and logistics industries.
Current editions include ANSI/ISA-95.00.01-2025 (IEC 62264-1 Modified), ANSI/ISA-95.00.02-2018 (IEC 62264-2 Mod) and ANSI/ISA-95.00.03-2013 (IEC 62264-3 Mod).