ISO 23704-2:2022

Overview

ISO 23704-2:2022 - "General requirements for cyber-physically controlled smart machine tool systems (CPSMT) - Part 2: Reference architecture of CPSMT for subtractive manufacturing" defines a reference architecture for cyber-physically controlled smart machine tool systems (CPSMT) used in subtractive manufacturing. Published by ISO in 2022, this part builds on ISO 23704-1 and focuses on architectural elements (logical and interface views) rather than physical or implementation details.

Key topics and technical scope

The standard organizes the CPSMT architecture into three primary components and several functional views:

• Cyber‑physically controlled machine tool (CPCM) - functional view of the machine tool, including the Machine Tool Unit (MTU) and the CPS control loops (inner‑loop, intra‑loop, inter‑loop).
• Cyber‑supporting system for machine tools (CSSM) - platform-level services such as the Data Processing Unit (DPU), Digital Twin Unit, MAPE (Monitor‑Analyze‑Plan‑Execute) unit, and External Interface Unit.
• Interface architecture - definitions for interfaces supporting:
  • Autonomous handling of machine abnormalities
  • Coordination with shop‑floor devices (SFDS)
  • Collaboration with shop‑floor control systems (SFCS)
  • Exchange with life‑cycle systems and humans via a Unified Interface System (UIS)
• Conceptual descriptions of Shop Floor Device System (SFDS), Shop Floor Control System (SFCS), and UIS
• Informative material including example use cases and a shop‑floor concept model

Important notes:

• The document provides conceptual and logical architectures; it does not specify physical hardware or implementation details.
• Functional elements include data fusion, data storage, state and behaviour models for digital twins, and interface schema/management.

Practical applications and intended users

ISO 23704-2:2022 is intended as a reference and guideline for stakeholders implementing Industry 4.0 / smart manufacturing solutions for subtractive processes:

• Design engineers and system architects creating smart machine tool systems
• Software engineers at machine tool builders (MTBs) and CNC/control vendors
• Solution and service providers integrating analytics, digital twins, and shop‑floor orchestration
• Factory operators and plant integrators who need standardized interfaces for interoperability

Adopting this reference architecture helps organizations design interoperable CPSMT solutions that enable predictive maintenance, autonomous fault handling, digital twin integration, and coordinated shop‑floor automation.

Related standards and context

ISO 23704-2 complements other Industry 4.0 and digital‑manufacturing frameworks referenced in the ISO text, including:

• ISO 23704-1 (foundational principles)
• ISO 23247 (digital twin framework)
• RAMI 4.0 (IEC PAS 63088), OPC‑UA, MTConnect and other interoperability standards

Keywords: ISO 23704-2:2022, CPSMT, cyber-physically controlled smart machine tool systems, subtractive manufacturing, reference architecture, CPCM, CSSM, digital twin, shop floor, UIS, SFDS, SFCS.