other · 2026

ISA/IEC 62443 Security Levels

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Abstract

This appendix provides an overview of the ISA/IEC 62443 security levels (SLs) and how an organization would use them as part of its design process.As noted in the Preface, this book is not intended to provide guidance to control system engineers on how to perform cybersecurity design.Instead, this section provides an informal background on how SLs are used in the design process.Appendix D explores the ramifications of assigning a particular SL, which is much like the impact of assigning a security integrity level (SIL) in terms of the difficulty and expense of implementing the design. Standard TermsISA 62443-1-1 defines an SL as a "level corresponding to the required effectiveness of countermeasures and inherent security properties of devices and systems for a zone or conduit based on assessment of risk for the zone or conduit." 1 1 ISA-62443-1-1 (99.01.

Cite this paper

APA 7

(2026). ISA/IEC 62443 Security Levels. https://doi.org/10.1002/9781394442447.app4

MLA 9

“ISA/IEC 62443 Security Levels.” 2026, pp. 117–38, https://doi.org/10.1002/9781394442447.app4.

Chicago

2026. “ISA/IEC 62443 Security Levels.” https://doi.org/10.1002/9781394442447.app4.

Harvard

(2026) ‘ISA/IEC 62443 Security Levels’. Available at: https://doi.org/10.1002/9781394442447.app4.

BibTeX

@misc{anon202662443,
  title = {{ISA/IEC 62443 Security Levels}},
  pages = {117--138},
  year = {2026},
  doi = {10.1002/9781394442447.app4}
}

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