Functional Safety is the study of methods and measures to reduce risk of harm to people and equipment when machines malfunction or when their operating environment is interrupted. Thinking of the 2018 FIFA World Cup that just ended, if we apply this to a game of football, referees have the ability and power to halt a game when they feel a violation occurs, but don’t always see everything and don’t always make the right call.
In the parlance of Functional Safety, these errors are called random hardware or systematic faults. These errors could make or break a game depending on which side of the field you’re on, so in an ideal sporting world, we could anticipate these erroneous calls and avoid them altogether. Functional Safety seeks to address a similar issue in systems design, where the cost of error could be catastrophic or fatal, such as a machine failing to detect an open panel and causing injury to the human operator or a railroad crossing gate failing and the training hitting a bus. Essentially, Functional Safety design tries to anticipate ways that systems can fail, and when they do, implement Plan B.
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