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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.
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.

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Resource Information and Configuration
- Resource Information and Configuration
- Material Model
- Material Inventory
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- Production Model
- 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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Operator Task List in the Workflow Client
Best Practices

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.

Variables are the input data used to build expressions. They can be literal values, represent an attribute of the event trigger, or can be bound to a data source.

Attribute	Value	Description
List	User-defined	Displays a list of variables that can be arranged by name.
Add	N/A	Click to add a new variable for use in expressions.
Delete	N/A	Click to delete the selected variable.
Name	User-defined alphanumeric string (A-Z, a-z, 0-9) up to 40 characters that cannot contain spaces	Specifies the name for a variable.
Bind variable to external data	User-defined alphanumeric string (A-Z, a-z, 0-9)	Select this option to create a variable that is bound to an external data source.
Configure Data Item	N/A	Select an external data source from those displayed on the Navigate tab, and specify additional input and output values for the data item's read and write functions. Note: Optional configuration information for the selected data item will vary, depending on the item that you select.
Bind variable to an attribute of the event trigger	System-defined	Select this option to create a variable that is bound to an attribute of the event trigger.
Attribute	User-defined	Select the trigger event attribute to which the variable is bound.
Data Type	System-defined	Displays appropriate settings based on the attribute chosen.
Default Value	System-defined	Specifies the input value for the attribute.
Variable represents a constant value	System-defined	Select this option to create a variable that represents a constant value.
Data Type	User-defined	Select the value of the data type. Note: For more information about the data types and their values, see Data Types.
Value	User-defined alphanumeric string (A-Z, a-z, 0-9) up to 50 characters	Specifies a value for the data type selected.