Event

Event is a collection of Actions that enables to inject logic, interact with peripherals via signals. Events have scope : Step and Job.

Event scope and classification

Event Types according to scope

Type

Description

Job Scoped

This type of events lives with the Job. They may be triggered at any time while Job is in execution.

Step Scoped

This type of events lives with the Step. They may be triggered at any time while Step is in active.

Event Types - Built in / Custom

Event Type

Description

Built-in Events

They have a built-in edge trigger mechanism as the names suggest.

Built-in events provide a single Execution List where user can insert actions to be executed when the built-in event is triggered.

Job scoped Built-in Events:

On Job Enter
On Process Leave
On Reject Leave
On Rework Leave
On Stop

Step scoped Built-in Events:

On Step Enter
On Step Leave

Custom Events

They are created/designed by the user and triggered by a selected signal together with an activation.

Signal may be a Boolean Tag or a Command returning a Boolean value. Activation defines the behavior for execution.

There are two Activation types:

Signal State (Polarity) Based
Signal Change (Edge Trigger) Based

Thus, for each activation type, two Execution Lists are provided to cover both sides of the Activation.

An example Built-in Event in Job Scoped Events

An example Custom Event in Step Scoped Events

Add-Edit-Delete an Event

Events are listed in the Events List. At the bottom of the list, Button is provided to add an Event.

Button	Description
	Edit Event name
	Enable / Disable Event. When disabled, it will not be executed.
	Delete Event

Execution Lists

Activation Type	Execution List and behavior
On Signal State (Polarity Based)	Execution List - While Signal is True While Signal State is True, List is executed repeatedly. When signal changes, execution of this list is terminated immediately.
On Signal State (Polarity Based)	Execution List - While Signal is False While Signal State is False, List is executed repeatedly. When signal changes, execution of this list is terminated immediately.
On Signal Changed (Edge Triggered)	Execution List - On Rise As soon as signal state becomes True, List execution is started. Execution will end when all the instructions in the list is completed.
On Signal Changed (Edge Triggered)	Execution List - On Fall As soon as signal state becomes False, List execution is started. Execution will end when all the instructions in the list is completed.

Protected Execution

For Edge triggered Events, retriggering issue ( while the list is is in execution, signal may change so that it causes another trigger for the list) is handled by the Protected Execution checkbox.

When Checked, a trigger that will occur in the activation signal while the list is being processed is ignored. And another list execution instance will not be created.

When Unchecked, a trigger that will occur in the activation signal while the list is being processed, will cause a creation and launch of an execution of another list execution instance.