Extensions.EventHandling.EventSource

Classification

Name	EventSource
Short Description	Event source that generates events
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 source data type identifies in OTX an event source, which generates events.

As soon as an event source is created, see Event Source Terms, begins to register certain events immediately. These events can then successively repeated calls to the WaitForEvent be read and removed activity.

About the CloseEventSource activity the event registration can be terminated immediately.

Event sources, the On-The-Fly within a WaitForEvent generated activity will be terminated automatically when you exit the activity.

Variables of type Event Source can not be initialized. It can no constants of type EventSource 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 term of the event source generated	EventSource eventSource = TimerExpiredEventSource(100); String s = ToString(eventSource); // Returns "TimerExpiredEventSource(100)"
ToByteField	Undefined (should not be used)

Sample

EventHandling.EventSource EventSourceVariable;