Element: Transition

A transition controls the transition behavior between states.

. A transition is possible when one of the following events occurs:

Conditional event or change event
Completion event (when the actions of the source state are completed)
Time event

A transition has a guard condition and can have an action. The state transition is usually executed when the evaluation of the guard condition detects a rising edge. As an alternative, you can configure to detect whether or not the guard condition is TRUE. When the state transition is executed with the next clock cycle, first the action is executed and then the switch is made to the end state.

When a source state has multiple outgoing transitions, each transition is prioritized. You can change the priority in the properties of the transition. The priority defines the order in which the guard conditions are checked and the order in which the transitions are switched.

Properties

Property	Description
Type	Transition
Priority	The priority defines the order of processing. Example: `1` Note If the state has other transitions and you change the priority, then all transitions are affected by the change and they are adapted automatically.
Rising edge	: When the guard condition yields a rising edge (from `0` to `1`), the transition is completed and the state transition is executed. Tip In the editor, an transition which behaves this way is indicated by the symbol. : When the guard condition is `TRUE`, the transition is run. Tip If the guard condition is always `TRUE`, then the transition is executed one time.

Property

Description

Type

Transition

Priority

The priority defines the order of processing.

Example: 1

Note

If the state has other transitions and you change the priority, then all transitions are affected by the change and they are adapted automatically.

Rising edge

: When the guard condition yields a rising edge (from 0 to 1), the transition is completed and the state transition is executed.
Tip
In the editor, an transition which behaves this way is indicated by the symbol.
: When the guard condition is TRUE, the transition is run.
Tip
If the guard condition is always TRUE, then the transition is executed one time.

User input

Action	Description
In the ToolBox view, select the Transition element. Click a state in the statechart. Click another state. A transition is created with a `TRUE` condition and an action symbol.	Note If you do not click an existing element, but in a blank area, then a new state is created.
Double-click the symbol. An input field opens. Select a Boolean variable or a Boolean expression.	When this condition is fulfilled, the switch is made to the transition.
Click the symbol two times. The Input Assistant opens. Select a method or action there.	When you start typing, the matching components appear in a list box. You can double-click to select the object. This selected method or action is executed when the transition has been switched.
Click a transition, the action symbol, or the guard symbol one time. The transition is selected. This is indicated by a blue arrow. Move the transition.	The line of a transition can be moved anywhere. The states remain in place.
Click the start or end of a transition. The symbol is displayed. Drag the symbol to another state.	You can use this function to move a transition to another state without losing the previous configuration. The corresponding condition and action remain unchanged.