ISA/IECISA/IEC 62443IEC 62443: Zones, Conduits & Security LevelsEASYFree question
An oil refinery has a control room with HMIs and a field area with RTUs. Should these be in the same zone?
- A.It depends on their security requirements and risk assessment
- B.Always no
- C.Only if they use Ethernet, a consideration that only matters when a safety instrumented system shares physical infrastructure with a basic process control system, a sharing arrangement that this question does not describe
- D.Always yes
Why A is correct
Zone assignment depends on whether the assets share common security requirements and risk profiles, not just their function or location.
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