IEC 62264 and ISA-95: Enterprise-control system integration

Having touched on the benefits of using ISO 18435 ( and having looked at the approach and scope of standard (, consider some of the specific extensions to be of use in the project.

A joint working group of the IEC SC65A and the ISO TC184/SC5 technical subcommittees is actively developing a multi-part IEC 62264 standard based on the ISA-95 specifications that define an information exchange framework to facilitate the integration of business applications and manufacturing control applications, within an enterprise.

In Part 3 of the ISA-95 standard, a hierarchy of activity domains within a manufacturing enterprise can be associated with a hierarchy of applications. At each level in both hierarchies, a group of functions is performed by a distinct grouping of resources to support a specific operational level of an enterprise. However, these resource groups form a hierarchy that distinguishes in which physical location and at which organizational level a resource is working. A combination of functional and resource hierarchies within an enterprise forms an application hierarchy.

The lower levels-2, 1, 0-comprise the activities of manufacturing operations, automation and control, and physical transformations.

ISA-95 defines the information structures and exchanges managed by Level 3 activities, applications, processes, resources, and functions, and how these information structures pass to and connect with the business applications at Level 4.

ISA-95 also defines a generic activity model for any Level 3 activity. In ISO 18435, a similar generic activity model is the plan for activities at Levels 2 and below.

Each activity at Level 2 can be associated with work center resources, while each activity at Level 1 involves work units.


Nicholas Sheble ( is the senior technical editor of InTech and edits the Channel Talk department. The sources for this content are ISA EXPO proceedings and The Advanced Technology Group. Read more about the ISO 18435 project at