In the Purdue model the physical sensors, actuators and drives that touch the process sit at which level?
- A.Level 2 operator supervisory screens
- B.Level 3 site manufacturing operations
- C.Level 4 enterprise business systems
- D.Level 0 field devices at the process
Why D is correct
Level 0 is the physical process with its instruments and final control elements. Level 2 holds operator supervisory screens, level 3 holds site operations and level 4 holds enterprise business systems.
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