ISA standards often eventually become part of the IEC standards and extend interpretations of existing IEC standards. For example, the previously mentioned ISA 99.0.1 standards became IEC 62443 for industrial network and system security. This standard's pedigree includes earlier defined ISO / IEC 27000 series standards.
IEC 62443 addresses securing external network communications paths into device networks, including the control network interconnect, interactive remote access to the control network, inter-control center access to the shared control net, standalone embedded devices, portable engineering computers and devices, and portable storage medium. It also addresses securing internal network communications paths within device networks for inter-area communications, control center networks within a single control area, and field...
