This chart illustrates a method for alarming based on threats and alarm segments.

• On the left side there are three possible triggers, marked by Tr1, Tr2, Tr3
• On the right side there are two possible risks, marked by Risk1, Risk2
• The triangles with the exclamation marks denote hazards.
• The arrows from left to right denote alarm segments, obtained in single-step FMEA.
• The red circle surrounding the two hazards denote threats.

Evidence-based alarming is an algorithm enabling identification of the trigger and the risk, provided that there is enough evidence.

In the example, the trigger identified is Tr1 and the risks identified is Risk1.

Updated on 31 Mar 2017.