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Plant architecture

The Purdue-style levels of a plant, from Level 0 physical process (pressure transmitter, control valve, motor starter) up through Level 1 PLC and remote I/O, Level 2 HMI, Level 3 site operations and Level 3.5 industrial DMZ to Level 4 enterprise and Level 5 cloud, with Firewall A and B and an industrial Ethernet ring of managed switches.

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