AutoQuiz: What Is the Standard for Embedded Software for a SIL 3 Certified Safety System?

AutoQuiz is edited by Joel Don, ISA’s social media community manager.

Today’s automation industry quiz question comes from the ISA Certified Automation Professional certification program. ISA CAP certification provides a non-biased, third-party, objective assessment and confirmation of an automation professional’s skills. The CAP exam is focused on direction, definition, design, development/application, deployment, documentation, and support of systems, software, and equipment used in control systems, manufacturing information systems, systems integration, and operational consulting. Click this link for more information about the CAP program. The following question comes from the CAP study guide, Performance Domain III, System Design.

Which of the following standards applies to the development of embedded software for a SIL 3 certified safety system?

b) IEC 61511
c) IEC 61508
d) 21 CFR Part 11
e) none of the above


Click Here to Reveal the Answer

According to IEC 61511-1, embedded software, which is part of the safety device/ controller, should follow software guidelines in IEC 61508-3. IEC 61508 is “Functional safety of electrical/electronic/programmable electronic safety-related systems.” IEC 61511 and ANSI/ISA84 are systems standards, not product standards. 21 CFR Part 11 is not relevant as it deals with electronic signatures.

SIL is Safety Integrity Level. ANSI is American National Standards Institute. IEC is International Electrotechnical Commission, and CFR is Code of Federal Regulations.

The correct answer is C, IEC G1508.

Reference: IEC 61511, IEC, 2003

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