Architectures represented are based on the IEC 62443 Industrial Automation and Control Systems (IACS) architecture reference model. The basic model consists of 5 levels.
Figure 1: An Architecture reference model
It is the Process or equipment under control
It includes the Controllers/PLCs that provide basic control, safety and protection functions
It includes supervisory control functions and includes devices such as HMIs, Operating workstations, Engineering Workstations, Historians, Application Servers, Engineering Databases, etc.
It includes the operations management functions such as domain controller, backup server, antivirus and patch management, etc.
It refers to the Enterprise systems
Source: International Association of Oil & Gas Producers
Acknowledgments: IOGP Instrumentation and Automation Standards Subcommittee (IASSC) Remote Operating Centres Task Force.
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