# ISA-95: Enterprise-Control System Integration

> ANSI/ISA-95 (commonly called ISA-95) is the international standard for developing an automated interface between enterprise systems and control systems.

- Canonical URL: https://wiki.aspotomasyon.com/article/isa-95-enterprise-control-system-integration
- Publisher: ASP OTOMASYON A.Ş. (ASP OTOMASYON Wiki)
- Category: Digital Transformation
- Published: 2026-07-21 · Updated: 2026-09-13
- Reading time: 4 min · Language: English

**ANSI/ISA-95** (commonly called ISA-95) is the international standard for developing an automated interface between enterprise systems and control systems. Published by the International Society of Automation and adopted as IEC 62264, ISA-95 provides a consistent framework for integrating manufacturing operations with business planning and logistics. For organizations pursuing digital transformation, ISA-95 is the foundational reference model that defines what information must flow between the plant floor and the enterprise.

![An industrial data workflow. Each handoff needs an owner and a documented data contract; collecting more signals alone does not establish business value.](https://wiki.aspotomasyon.com/assets/diagrams/digital-transformation-context.svg)

*An industrial data workflow. Each handoff needs an owner and a documented data contract; collecting more signals alone does not establish business value.*

## The Purdue Enterprise Reference Architecture

ISA-95 is built upon the Purdue model, which defines a hierarchical functional model of manufacturing operations. The model separates enterprise and control functions into distinct levels:

```
  Level 4 — Business Planning & Logistics
  ┌─────────────────────────────────────────┐
  │ ERP (Enterprise Resource Planning)       │
  │ Order processing, production scheduling, │
  │ shipping, material procurement           │
  └──────────────────┬──────────────────────┘
                     │ (business data)
  Level 3 — Manufacturing Operations Management
  ┌──────────────────┴──────────────────────┐
  │ MES (Manufacturing Execution System)     │
  │ Production tracking, quality management, │
  │ maintenance management, performance      │
  │ analysis, work dispatching               │
  └──────────────────┬──────────────────────┘
                     │ (production data)
  Level 2 — Supervisory Control
  ┌──────────────────┴──────────────────────┐
  │ SCADA, HMI, batch control, engineering   │
  │ workstations, alarm management          │
  └──────────────────┬──────────────────────┘
                     │ (supervisory data)
  Level 1 — Basic Control
  ┌──────────────────┴──────────────────────┐
  │ PLC, DCS, SIS, RTU, CNC controllers      │
  └──────────────────┬──────────────────────┘
                     │ (process data)
  Level 0 — Physical Process
  ┌──────────────────┴──────────────────────┐
  │ Sensors, actuators, motors, valves,      │
  │ field instruments                        │
  └─────────────────────────────────────────┘
```

## ISA-95 Standard Parts

The ISA-95 standard is organized into multiple parts, each addressing a specific aspect of enterprise-control integration:

| Part | Title | Status | Focus |
| --- | --- | --- | --- |
| Part 1 | Models and Terminology | Published (IEC 62264-1) | Defines consistent terminology, hierarchy models, functional data flow, object models, and operations activity models. |
| Part 2 | Object Model Attributes | Published (IEC 62264-2) | Defines attributes for every object in Part 1. Used as the basis for information exchange and relational databases. |
| Part 3 | Models of Manufacturing Operations Management | Published (IEC 62264-3) | Focuses on Level 3 activities (MES layer). Defines production, quality, maintenance, and inventory operations. |
| Part 4 | Object Models and Attributes for MOM | Published (IEC 62264-4) | Defines object models for information exchange between MES activities. |
| Part 5 | Business-to-Manufacturing Transactions | Published (IEC 62264-5) | Defines transactions between enterprise and manufacturing systems. |

## ISA-95 Object Models

ISA-95 Part 1 defines a set of object models that categorize the elements of manufacturing operations:

- **Personnel Model** — Qualified personnel, certifications, and roles.
- **Equipment Model** — Physical and logical equipment hierarchy (enterprise, site, area, process cell, unit, equipment module, control module).
- **Material Model** — Material classes, material lots, material definitions, and material sub-lots.
- **Process Segment Model** — Segments of the manufacturing process that define what equipment and materials are used.
- **Production Schedule and Performance** — Production requests, production rules, and actual performance data.
- **Operations Definition and Schedule** — Detailed manufacturing operations and their sequencing.

## B2MML — Business To Manufacturing Markup Language

**B2MML** is an XML implementation of the ISA-95 standard, maintained by the Manufacturing Enterprise Solutions Association (MESA). It provides a standardized schema for exchanging ISA-95-defined information between systems such as ERP, MES, and control systems. B2MML enables:

- Standardized data exchange between SAP ERP and plant-floor systems.
- Interoperability between MES platforms from different vendors.
- Consistent object model representation across the enterprise.
- Reduced integration engineering effort through pre-defined schemas.

## Practical Implementation

Implementing ISA-95 in an industrial environment typically involves:

1. **Define the equipment hierarchy** — Map physical assets to the ISA-95 model (enterprise → site → area → process cell → unit).
2. **Identify information flows** — Determine what data must move between each level (production schedules downward, production results upward).
3. **Select integration technology** — OPC UA (with ISA-95 companion specifications), MQTT, REST APIs, or middleware platforms.
4. **Map object models** — Define how material, equipment, and personnel data is structured and exchanged.
5. **Implement transactions** — Configure production schedules, work orders, material consumption, and quality results exchange.

> ASP OTOMASYON designs and implements ISA-95-aligned integration architectures for Turkish manufacturers, connecting plant-floor control systems with ERP and MES platforms using OPC UA and modern middleware solutions.

## Apply this to your project

- Name the operational decision, its owner, and the evidence required to judge whether it improved.
- Document asset identifiers, units, timestamps, quality rules, and definitions shared between OT and business applications.
- Compare the pilot against a recorded baseline before extending it to other machines or sites.

[Follow an ASP project guide](https://wiki.aspotomasyon.com/guides) to connect the fundamentals with implementation and acceptance.

![Engineering review sequence: Question → Baseline → Pilot → Scale. Keep the recorded evidence with the accepted configuration.](https://wiki.aspotomasyon.com/assets/diagrams/digital-transformation-review.svg)

*Engineering review sequence: Question → Baseline → Pilot → Scale. Keep the recorded evidence with the accepted configuration.*

## Primary references and further reading

Use the original specifications and product documentation for implementation details. The examples in this guide are illustrative engineering scenarios, not published project results.

- [ISA — ISA-95 enterprise/control system integration](https://www.isa.org/standards-and-publications/isa-standards/isa-95-standard)
- [OPC Foundation — Information modelling](https://opcfoundation.org/about/opc-technologies/opc-ua/)

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Cite the canonical article: https://wiki.aspotomasyon.com/article/isa-95-enterprise-control-system-integration (ISA-95: Enterprise-Control System Integration, ASP OTOMASYON, updated 2026-09-13).