User's Manual

78 Controlling a Street Lighting Network
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
at a configured amount of time before or after. 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 change the state and
values of the luminaires on the network. In the daily schedule, you 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
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 can just turn on the lights in the
dimmed state at sundown. Or if sundown occurs before the start of rush hour, it
can 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 based 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 User’s Guide .
To create a schedule for a street lighting network, perform the following general
steps:
1. Configure the Real-Time Clock on the SmartServer. See
Configuring the
Real-Time Clock
on page 79.
2. Create an Event Scheduler. See
Creating Event Schedulers on page 83.