IEC 62443-4-2:20 19提供了与IEC TS 62443-1-1中描述的七项基本要求（FRs）相关的详细技术控制系统组件要求（CRs），包括定义控制系统能力安全级别及其组件SL-C（组件）的要求。 根据IEC TS 62443-1-1中的定义，共有七项基本要求（FR）: a)识别和认证控制(IAC)， b)使用对照(UC)， c)系统完整性(SI)， d)数据保密性(DC)， e)受限数据流(RDF)， f)对事件的及时响应(TRE)，以及 g)资源可用性(RA)。 这七个FR是定义控制系统安全能力等级的基础。定义控制系统组件的安全能力水平是本文件的目标和目的，而不是SL-T或已实现的SLs（SL-A），后者超出了范围。

IEC 62443-4-2:2019 provides detailed technical control system component requirements (CRs) associated with the seven foundational requirements (FRs) described in IEC TS 62443-1-1 including defining the requirements for control system capability security levels and their components, SL-C(component).
As defined in IEC TS 62443-1-1 there are a total of seven foundational requirements (FRs):
a) identification and authentication control (IAC),
b) use control (UC),
c) system integrity (SI),
d) data confidentiality (DC),
e) restricted data flow (RDF),
f) timely response to events (TRE), and
g) resource availability (RA).
These seven FRs are the foundation for defining control system security capability levels. Defining security capability levels for the control system component is the goal and objective of this document as opposed to SL-T or achieved SLs (SL-A), which are out of scope.