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Control Loop Diagram is a diagram to show a control loop with actions and feedback. By creating a control loop diagram of “Unsafe Control Actions”, it will help you identify the hazard causal factor.
To create a Control Loop Diagram, open a Control Structure Diagram, right-click on a link or Control Action and click [Generate Control Loop Diagram] from the context menu.
Then a new Control Loop diagram will be generated with two Components that the selected Link/Control Action connects. Other related Components will be shown as a small boxes.
There is a [Hint Word Set] menu on the toolbar of the diagram. Clicking [Hint Word Set] will open up a window with hint words (guide phrases) and the structure. Use this hint words to analyze this loop to find out what makes this control action unsafe and identify the hazard causal factor.
You can switch the Hint Word that fits your analysis the most.
To do so, click [Hint Word Set] on the toolbar to open the Hint Word.
And switch to one you want to use.
There are two pre-installed Hint Word sets in Astah System Safety.
You can customize the Hint Words and also create your own and select a default set.
To do so, please refer to Hint Word.