Extensions.EventHandling.Event

Classification

Name	Event
Short Description	Event, which has been generated by an event source
Class	Complex Data Type
Base Data Type	ComplexType
Default Value	Empty
Provide a Literal	No
SpecifiedBy	ISO 13209-3
Standard Compliant	Yes

Description

The event data type identifies in OTX an event by an event source (event source was generated). The data type contains information about a single event.

Events can not explicitly (programmatically) are generated by activities or term. They are only implicitly via so-called event sources (event source generated).

On events may in the end with the waitforevent activity to be maintained.

Variables of type event can not be initialized. It can no constants of type event be declared.

Other libraries can define other event sources, eg HMI: Screen Event Source

Core Conversion

The following table shows the rules for conversion to another data type:

Conversion	Result	Sample
ToBoolean	Undefined (should not be used)
ToInteger	Undefined (should not be used)
ToFloat	Undefined (should not be used)
ToString	Returns the type of the event source generated	EventSource eventSource = TimerExpiredEventSource(100); Event event = WaitForEvent(eventSource); String s = ToString(event); // Returns "TimerExpiredEvent"
ToByteField	Undefined (should not be used)

Sample

EventHandling.Event EventVariable;