Extensions.EventHandling.MonitorChangeEventSource

Classification

Name	MonitorChangeEventSource
Short Description	Create an event source for change event
Class	Term
Extension	OTX EventHandling extension
Group	Event source related terms
Exceptions	-
Checker Rules	Event_Chk002
Standard Compliant	Yes

OTL Syntax

EventSourceTerm = EventHandling.MonitorChangeEventSource(Variable);

Description

The OTX MonitorChangeEventSource term creates an event source that monitors the value of a variable and an event triggers when the value changed. Event queue should start immediately as soon as the event source is created.

The case when a value to a previously uninitialized variable is assigned to count as a change event and make no mistake.

Return Value

The Term returns the value, see table below.

In OTX, Terms are categorized according to its return data type!

Data Type	Description
EventSource	The EventSource, the changes in the value of a variable monitored.

Properties

Name	Data Type	Class	Default	Cardinality	Description
Variable	-	Variable	-	[1]	The variable which has to be monitored.

OTL Examples

Boolean Bool1 = false;
EventHandling.EventSource EventSource1;
EventHandling.Event Event1;

EventSource1 = EventHandling.MonitorChangeEventSource(Bool1);

parallel
{
   lane
   {
      Bool1 = true;
   }
   lane
   {
      EventHandling.WaitForEvent({EventSource1}, Event1);
   }
}

See also

ThresholdExceededEventSource
TimerExpiredEventSource