Fault Tree Analysis Constraints

In order to permit analysis, all fault tree diagrams created in BlockSim must conform to the following constraints:

A diagram must contain a top gate and at least one event.
All blocks in the diagram must be connected.
An event can have only one output event, and no input events or gates.
Additional gates are not allowed below a load sharing gate or standby gate.
The inputs to negative gates (i.e., NOT, NAND and NOR gates) must be fixed probabilities, or evaluate to fixed probabilities; this is checked at analysis, and any input that evaluates to a time-varying model will result in an error.