Harmony of standards

We understand the rationale for and concept of ISO 18435 from last month's Channel Talk (www.isa.org/link/0107Channel).  It facilitates interoperability by defining a set of integration models and interfaces based on the enterprise-control system integration approach of ISO/IEC 62264 (ISA-95) and emerging standards for condition-based monitoring (ISO 13374). 

Look now at the approach, purpose, and scope of the standard.

ISO 18435 provides a framework for harmonized use of selected industry and international standards in order to enable device suppliers, system integrators, and application designers to apply common terms and rules for integrating control, diagnostics, prognostics, capability assessment, and maintenance applications. 

By using a common application integration modeling approach, one can identify and concisely document key interoperability interfaces in terms of their profiles. 

These application interoperability profiles help when evaluating whether applications can readily integrate with each other.

The approach involves using:

  • An enterprise-control system integration framework defined in IEC 62264 that provides information exchange and activity models used to interface control systems to business systems 
  • An application integration framework of ISO 15745 that provides integration models for processes, resources, and information exchanges in an application
  • An information model in ISO 13374 for asset condition monitoring

In the ISO 18435 scheme, the ISO 15745 application integration framework extends to other levels in application hierarchy, along with the adaptation of the activity models in IEC 62264 to the lower levels of the functional hierarchy.

Scope of the standard
ISO 18435 defines activity-reference integration models and their use to integrate diagnostics, capability assessment, and maintenance applications with the applications in production, control, and other manufacturing operations.

An activity-reference integration model includes:

  • Activities within the various functional and resource hierarchies in a manufacturing enterprise
  • Interoperability interfaces used in the integration of these activities
  • Generic interoperability templates used to denote various types of interfaces and their configurations
  • Set of interoperability profiles to denote integration across target application domains.


Nicholas Sheble (nsheble@isa.org) edits the Channel Talk department. The source for this content is ISA EXPO proceedings and The Advanced Technology Group. Read more about the ISO 18435 project at http://www.isa.org/intech/jan07/integration.