Extensions.EventHandling.ThresholdExceededEventSource

Classification

Name	ThresholdExceededEventSource
Short Description	Create an Event Source for changes outside area
Class	Term
Extension	OTX EventHandling extension
Group	Event source related terms
Exceptions	-
Checker Rules	Event_Chk001 Event_Chk002
Standard Compliant	Yes

OTL Syntax

EventSourceTerm = EventHandling.ThresholdExceededEventSource(SimpleTerm, SimpleTerm, Variable);

Description

The OTX ThresholdExceededEventSource term creates an event source that monitors the value of a variable and an event triggers when the value goes outside a certain range. If the value of start is already outside the specified range, the event should be triggered. Event queue should start immediately as soon as the event source is created.

This event source is to apply only for the data types on which an order relation can be defined, namely the simple type data types.

Important: A ThresholdExceededEventSource which is applied to an uninitialized variable shall also count as threshold exceeded event and does NOT pose an error.

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 Event Source, the changes in the value of a variable monitored within the value range.

Properties

Name	Data Type	Class	Default	Cardinality	Description
Variable	-	Variable	-	[1]	Represents the variable that shall be monitored.
LowerThreshold	Simple	Term	-	[1]	Represents a value to compare against. If the value of the monitored variable becomes less that this value, the event shall be fired.
UpperThreshold	Simple	Term	-	[1]	Represents a value to compare against. If the value of the monitored variable becomes greater than this value, the event shall be fired.

OTL Examples

Float LowerThreshold1 = 1;
Float UpperThreshold1 = 99.9;
EventHandling.EventSource EventSource1;
Float Variable1 = 8;
EventHandling.Event Event1;

EventSource1 = EventHandling.ThresholdExceededEventSource(LowerThreshold1, UpperThreshold1, Variable1);

parallel
{
   lane
   {
      while (true) : WhileLoop1
      {
         Variable1 = Variable1 + 1;
      }
   }
   lane
   {
      EventHandling.WaitForEvent({EventSource1}, Event1);

      terminate;
   }
}

See also

WaitForEvent
IsThresholdExceededEvent
TimerExpiredEventSource