The post Standard for Embedded Software for SIL 3 Certified Safety System first appeared on the ISA Interchange blog site.
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 information about the CAP program. his question is from the CAP study guide, Performance Domain III, System Design.
Which of the following standard applies to the development of embedded software for a SIL 3 certified safety system?
a) ANSI/ISA-84
b) EC 61511
c) IEC 61508
d) 21 CFR Part 11
e) answers a) and d)
According to IEC 61511-1, embedded software, which is part of the safety device/controller, should follow software guidelines in IEC 61508-3. IEC 61511 and ANSI/ISA-84 are system standards and not product standards. 21 CFR Part 11 is not relevant as it deals with electronic signature.
The standards bodies in acronyms are the International Electrotechnical Commission (IEC), American National Standards Institute (ANSI), International Society of Automation (ISA) and the Code of Federal Regulations (CFR), which refers to the U.S. federal government. Reference: IEC 61511, IEC, 2003.
The correct answer is C, IEC 61508.
Source: ISA News
