I&C systems important to safety may be implemented using conventional hard-wired equip-ment, computer-based (CB) equipment or by using a combination of both types of equipment.This International Standard provides requirements and recommendations (see note) for the total I&C system architecture which may contain either or both technologies.
NOTE In the following, the term requirements is used as a comprehensive term for both requirements and recommendations. The distinction appears at the level of the specific provisions. where requirements are expressed by “shall” and recommendations by “should”.
