How to Create a Fault Tree Analysis Diagram (FTD) in ConceptDraw PRO

The failure of an item in a system is often caused by the failure of other items. Fault Tree Analysis, or FTA, provides a method of breaking down such chains of failures, with a key addition for identifying combinations of faults that cause other faults. Fault Tree Analysis Diagrams (or negative analytic trees) are logic block diagrams that display the state of a system (top event) in terms of the states of its components (basic events). ConceptDraw PRO allows you to create professional FTA Diagrams using the Fault Tree Analysis Diagrams solution.

1. Open a ConceptDraw PRO new document and select the Fault Tree Analysis Diagrams library.
2. Add the proper FTD elements to the diagram by dragging them from the library to the document page.
3. The Fault Tree diagram should be started with the Event symbol for top-level failure event.
   
4. Use the OR gate symbol to the output event occurs if at least one of the input events occurs.
   
5. The Basic event symbol is used for event that does not have any contributory events.
   
6. An AND gate symbol means the output event occurs if all input events occur.
   
7. Use the Exclusive OR gate symbol to the output event occurs if exactly one input event occurs.
   
8. Connect the FTD elements by the arrow connectors using the button .

Result: Fault Tree Analysis Diagram helps you to analyze the probability of functional system failures and safety accidents.