IACS Network Design

This topic addresses the design of networks for Industrial Automation and Control Systems (IACS).

These include networks ranging from simple low speed Modbus links between PLCs to sophisticated high speed self-healing networks capable of monitor and control of large production facilities. IACS networks typically exist "below industrial firewalls" where they connect systems like DCSs (Distributed Control Systems), SCADA (Supervisory Control and Data Aquistion), Data Historians, and Emergency Shutdown Systems (ESDs). They often also operate in hazardous environments containing electrical, chemical, explosive or nuclear risks.

This topic also includes industry-specific networks, such as long-distance SCADA or specialized manufacturing networks containing advanced robotics.

The following describes a practical PERA approach for design of high integrity networks for use in hazardous areas.

• This white paper describes PERA Physical Network Design Principles (G. A. Rathwell)
  and how to use them during the design process.(PDF 3 pages)
• PERA Reference Model for Computer Integrated Manufacturing (ISA Publication)
  This two-volume set provides a generic model for the Control and Information System of any manufacturing facility. It contains two major sub-models:
  • A data flow model showing how data flows between allfunctions in an enterprise, and
  • A "hierarchical model" which shows how the functions are divided up beween the various "levels" of management (i.e. what your boss does vs. what you do).