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Resource Information and Configuration
Events Model
Events Model
Events are a fundamental part of production. The events model is used to map out the critical events that occur to control production. These events can be created within this application or from external systems, and can be used to control workflow execution.
Condition Events
Condition events are defined by logical expressions against variable values. When these components are set and enabled, they are monitored by the system. When expressions evaluate to true, the event occurs and subscribers to the event are notified.
Evaluation of Condition Expressions
The Trigger Settings tab allows you to determine when the configured condition expressions will be evaluated. The results of these evaluations determine whether or not the event can run.

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Resource Information and Configuration
- Resource Information and Configuration
- Material Model
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- Events Model
  - Events Model
    Events are a fundamental part of production. The events model is used to map out the critical events that occur to control production. These events can be created within this application or from external systems, and can be used to control workflow execution.
    - Enable an event
    - Disable an event
    - Time Events
      Time events can be set by time span or by calendar, and they can be either single or recurring events.
    - Condition Events
      Condition events are defined by logical expressions against variable values. When these components are set and enabled, they are monitored by the system. When expressions evaluate to true, the event occurs and subscribers to the event are notified.
      - Properties and Attributes of Condition Events
        The Details tab offers general information about the selected condition event.
      - Evaluation of Condition Expressions
        The Trigger Settings tab allows you to determine when the configured condition expressions will be evaluated. The results of these evaluations determine whether or not the event can run.
        Set a trigger for a conditional event
        Set up class-based events
        You can bind class properties to event variables so that an event can detect a property change in any equipment to which that class has been added.
        Create variables for a condition event
        Create an expression for a condition event
        Condition Event Expression Variables
        The Variables tab allows you to add, modify, and delete expression variables to use when building event expressions. You can define one or more variables, which can be a constant value bound to an attribute of the trigger event, or bound to external data.
        Condition Expressions
        The Condition Expressions tab allows you to create expressions using mathematical or Boolean logic.
        Event Sources
        Event sources are data items that you can subscribe to.
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Evaluation of Condition Expressions

The Trigger Settings tab allows you to determine when the configured condition expressions will be evaluated. The results of these evaluations determine whether or not the event can run.

These settings are outlined when a Create Event activity in a workflow is created.

The following table provides more information on the outcome of selecting a trigger type:

Trigger	Value	Description
Trigger only on Variable Value changes	System-defined	Evaluates the expressions when a variable changes. These changes can occur through a bind to external data or to an attribute of another event.
Trigger on Event or Variable Value changes	System-defined	Evaluates the expressions when a variable changes or when the selected event trigger is signaled.
Trigger only on Event	System-defined	Evaluates the expressions only when the selected event trigger is signaled.
Set Event Trigger	N/A	Click to open the Configure Event Trigger dialog box and select the appropriate event trigger.
Clear	N/A	Click to clear the selected event trigger.