Code

Enter the element code in this text box. This should be unique for the diagram.

Events with the same code are considered as identical during the calculation.

For a gate, enter its code.

For an event, enter the code for the new event or choose it from the list, if the event is already in the library.

New node automatically receives the Code equal to the predecessor’s node code plus the number of successors. For example, if top event’s code is “AAA”, the predecessors receive codes “AAA-1”, “AAA-2”, etc. This is only a default value and can be changed by user.

Name

Enter the element name in this text box.

Description

Enter a description for the element in this text box.

Negated

Select this check box if you want the gate or event to be negated (NOT operation applied).

K

Enter a value for K-out-of-N gate - K argument.

N

Enter a value for the N for K-out-of-N gate (calculated automatically by the number of gate's children)

Border style

Select a border style of the gate/event box (Solid, Dot, etc.) from the drop down list.

Background color

Select a background color of the element from the color palette.

Font

Select a font for the element code and name.

Foreground color

Select a foreground color of the element from the color palette.

Event type

Select an Event reliability model from the list (Probability, Frequency, Repaired, Unrepaired, etc.). See the detailed description of available models in the Basic Event Types paragraph.

Logical state

Select a Logical state for House events from the drop-down list.

FR

Select a Failure rate from the drop-down list (failures per million or billion of hours, depending on project settings).

FR multiplier

Enter a value for Failure Rate multiplier. (FR used in unavailability calculation is item FR  * FR Multiplier.)

Probability q

Enter a value for Probability q.

Frequency f

Enter a value for Frequency F.

MTTR

Enter a value in hours for MTTR (Mean Time To Repair).

Test interval

Enter a value in hours for the Test interval (time between periodical tests).

Time to first test

Enter a value in hours for Time to first test.

Mission time

Enter a value in hours for the Mission time.

Q(t)

Calculated value for the Unavailability Q(t) - probability of failure at a given time point.

Q mean

Calculated value for the Probability or long-term steady-state average unavailability, Q.

Tree ID

For events, ID of linked element in Product Tree. Press the "Select" button next to the field to pick up product tree item from the product tree.

FM number

For events, number of FMECA Failure Mode of linked element in Product Tree. Press the "Select" button next to the field to pick up specific failure mode from the list of linked product tree item's failure modes.

CCF Group

Code of Common Cause Failure Group the basic event belongs to. Use "Select" and "Clear" buttons near this field to add/remove it from the CCF Group.