How to create a relationship between a "signal" and a transition (StateMachine)

[RealPecho]

In a state machine i'm using to describe the transition some signal names to describe the guard.
The signals are already in the model defined with an element of type "Signal".
Is there any way to create using SysML or UML a relationship between?
Because in my model the signal are defined, but they doesn't have a relationship link

[Geert Bellekens]

A guard is a condition that has to be true before the transition can be followed. I don't think a signal can be a guard.

Geert

[RealPecho]

yes. ok lets say the condition is, when the signal is bigger than a treshhold. i have to model the threshold as an element also.
in this case how to create a linik (relationship) between this elements and the condition (Guard)?

[qwerty]

The signal goes into a state and that exits with a certain guard.

q.