Level 1: Process Control
Level 2: Supervisory Control
Level 3: Advanced Control
Level 3.5: DMZ
Level 4: Plant Information Network
Description
1
Provides increased security between Level 4 and lower levels using a network-attached firewall.
2
Designed for reliability and availability to maintain constant view of the process. It is the backbone for process control and monitoring.
3
Includes the PCN, and may contain instrument asset management systems, computer authentication and authorization services, process data historian servers, and process alarm management servers.
4
Consists of programmable logic controllers that sense and manipulate the physical process.
5
Shall be physically and logically separated from lower levels for availability, integrity, security and information protection of significant and mission-critical systems.
6
The actual physical process, including field instruments and analyzers directly connected to the process equipment
Level 1: Process ControlLevel 2: Supervisory ControlLevel 3: Advanced ControlLevel 3.5: DMZLevel 4: Plant Information NetworkDescription1Provides increased security between Level 4 and lower levels using a network-attached firewall.2Designed for reliability and availability to maintain constant view of the process. It is the backbone for process control and monitoring.3Includes the PCN, and may contain instrument asset management systems, computer authentication and authorization services, process data historian servers, and process alarm management servers.4Consists of programmable logic controllers that sense and manipulate the physical process.5Shall be physically and logically separated from lower levels for availability, integrity, security and information protection of significant and mission-critical systems.6The actual physical process, including field instruments and analyzers directly connected to the process equipment
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