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Guidance on Architectures from ISA TR84.00.09:2013
§
Annex A - Example SIS Interfaces to the Enterprise Network
describes a series of example security architectures on how
to implement SIS:
Air-gapped, Interfaced, Integrated 2 zone, Integrated 1 zone.
§
" The examples are conceptual and not intended as a
template for every system. They are intended to represent
different approaches an end user might elect to implement a
SIS.“