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This part of the ISA-62443 series provides detailed technical control system requirements (SRs) associated with the seven foundational requirements (FRs) described in ANSI/ISA-62443-2-1 (99.02.01)-2009 including defining the requirements for control system capability security levels, SL C (control system). These requirements would be used by various members of the industrial automation and control system (IACS) community along with the defined zones and conduits for the system under consideration (SuC) while developing the appropriate control system target SL, SL-T(control system), for a specific asset.