In summary, functional safety is a growing aspect of industrial applications. It was developed to counteract unacceptable catastrophic failures, while at the same time drive plant profitability and reduce insurance pressure. Functional safety is the portion of safety that depends on the process or equipment. There are two industry standard ratings that refer to functional safety: SIL and Ple. In both cases, the higher the rating the less likely a component or system is to fail. Due to their design, additional controls are possible with SIL rated product, which can open up possibilities that were not possible before.