Echelon i.LON SmartServer 2.0 Power Line - Manual (Page 82)

68 Controlling a Street Lighting Network with the Scheduler Application
Scheduling Overview
The SmartServer contains an Event Scheduler application that you can use to schedule data point
updates (called events) to occur at sunrise and sundown, or a configured amount of time before or
after. This means that, for example, you can schedule luminaires to turn on at sundown, dim at the end
of the evening rush hour, brighten at the start of the morning rush hour, and then turn off at sunrise.
Each Event Scheduler includes day-based daily schedules and date-based exception schedules. To
create a daily schedule, you specify the days for which the schedule occurs (for example, Monday–
Friday or Saturday–Sunday) and then create the events to be executed by the schedule. To create an
exception schedule, you select a range of dates for which an exception occurs and specify how
frequently the exception recurs such as every weekday or weekend day. After you create the exception
schedule and define when and how often it occurs, you create events in the exception schedule.
The events you create in the daily and exception schedules will change the state and values of the
luminaires on the network. In the daily schedule, you will create events that turn on, brighten, and dim
the streetlights based on the times at which the morning and evening rush hours start and end. In the
exception schedule, you will create events that turn on and turn off the light based on the sunrise and
sundown times.
You can create a single Event Scheduler that handles multiple street lighting network scenarios. For
example, you could create an Event Scheduler that turns the luminaires on at sundown while the
evening rush hour is ongoing, and then dims them at the end of the evening rush hour. If the evening
rush hour ends before sundown, the same Event Scheduler will just turn on the lights in the dimmed
state at sundown. Or if sundown occurs before the start of rush hour, it will turn on the lights in the
dimmed state at sundown, brighten them at the beginning of the evening rush hour, and dim them back
at the end of the evening rush hour.
Before you can schedule events bases on sunrise and sundown, you need to configure the Real-Time
Clock on the SmartServer. The Real-Time Cock maintains the current date and time on the
SmartServer. It also includes an astronomical position sensor application that takes the time stored on
the SmartServer and its location (geographic coordinates), and determines the position of the sun
(elevation and azimuth) relative to the SmartServer, calculates the sunrise and sundown times based on
the position of the sun, and then passes the calculated sunrise and sundown times to the Event
Scheduler.
Tip: You can use a data logger to verify that your Event Scheduler is updating the data points at the
appropriate times. For more information on using the Data Logger and using the Scheduler
application, including for network applications other than street lighting, see the i.LON SmartServer
2.0 User’s Guide.
To create a schedule for a street lighting network, follow these steps:
1. Configure the Real-Time Clock on the SmartServer.
2. Create an Event Scheduler.
3. Select the data points to be updated by the Event Scheduler.
4. Create the daily schedules. This entails setting the days for which the daily schedules are used and
creating events.
5. Create the exception schedules. This entails setting the range of dates and recursions for which
the exception schedules are used and creating events.
Configuring the Real-Time Clock
The real-time clock on the SmartServer provides the Event Scheduler with calculated sunrise and
sundown times. To do this, you add an SNTP time server to the LAN on which the SmartServer
resides or manually specify the time. After you have stored the time of day on the SmartServer, you
enter the geographic coordinates of the SmartServer.