Functional safety is the part of the overall safety of a system or piece of equipment that depends on automatic protection operating correctly in response to its inputs or failure in a predictable manner (fail-safe). The automatic protection system should be designed to properly handle likely human errors, hardware failures and operational/environmental stress.

功能安全Functional Safety)也稱為機能安全,是指和一個系統或是設備整體安全的組成部份[1] 。其達成安全性的方式是靠系統或組成零件在接受輸入訊號後,可以正常的動作[2]。例如一個馬達中加裝溫度感測器,若溫度超過一定值,即停止馬達運轉,此機能就屬於功能安全。

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