To set up a scheduler in Appian, you configure a Timer Trigger on the Start Event of your process model in the Process Modeler, setting a time delay, recurrence (e.g., daily, hourly), specific dates, or using advanced expressions for complex schedules like the last working day of the month, all managed within the Triggers tab of the Start Event properties.

Steps to Configure a Timer Trigger:

1. Open Process Modeler: Open your Appian Process Model in the Process Modeler.
2. Select Start Event: Double-click the Start Event node (the circle) on the canvas.
3. Go to Triggers Tab: In the Start Event properties dialog, navigate to the Triggers tab.
4. Add Timer Trigger: Under "Start Event Triggers," select the Timer option and click to add it.
5. Configure Timer:
6. Click Configure on the new Timer Event.
7. In the Timer Event dialog, go to the Setup tab.
8. Scheduled Delay: Set a delay (e.g., "Delay for 10 Minutes") or use an expression for more complex timing.
9. Recurrence: Choose a frequency like "Every Day," "Every Hour," or specific dates/times.
10. Timezone: Specify the timezone for the schedule.
11. Advanced Options: Use expressions for complex conditions (e.g., run only on business days, first/last day of month) by checking "Show Advanced Options" and writing logic like day(today()) = daysinmonth(month(today()), year(today())) for the last day of the month.
12. Save & Test: Save your process model and test the logic to ensure the timer triggers as expected.