GLOSSARY

Safety Function

A safety function is a specific protective job a machine’s control system performs, such as stopping motion the moment a guard is opened.

Each one is defined by its trigger, its response and how reliable it must be, expressed as a required Performance Level or SIL. The list of safety functions falls out of the risk assessment, and each is validated before the machine goes into service.

Other Terms

Competent Person

A competent person is someone with the practical and theoretical knowledge and experience needed to carry out a specific safety-critical task, such as a LOLER thorough examination.

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