Echelon SmartServer 2.2 - Manual (Page 357)

358 Scheduling
Scheduling Overview
The SmartServer contains an Event Scheduler application that you can use to update data points at
specific times. Each Event Scheduler includes a day-based daily schedule and a date-based exception
schedule.
The daily schedule occurs every week on a specified day. You can assign a single daily schedule to
multiple days of the week. For example, you can define two daily schedules: one for weekdays and
another for weekends, or you can even define seven daily schedules (one for each day of the week) to
create a weekly schedule.
The exception schedule may occur on holidays, inventory, or on any user-specified date or range of
dates when the system being controlled requires specific events or needs to be shut down. You use the
exception schedule to enable alternate daily schedules to become active on a range of user-specified
dates such as “January 12
th
to February 2
nd ” or on recurring dates such as “Every other Monday” or
“the third Monday of every month.” You can also use the exception schedule to schedule events to
occur at sunrise and sundown or a specified period of time before or after.
The daily and exception schedules both consist of a series of events. An event is a data point update
that occurs at specific time. An event includes a time and a value, typically a preset, to which the
selected data points are updated (for example, 09:00: OPEN). You can use presets to enable one or
more data points to be updated at a time. For example, you can use the OPEN event to set the
temperature for an HVAC system and turn on the lights, as long as the data points for those systems
have been added to the Event Scheduler.
All Event Schedulers are connected to the Event Calendar and the Real-Time Clock on the
SmartServer. The Event Calendar contains exceptions that are applied globally to the Event
Schedulers on the SmartServer. The Real-Time Clock maintains the current date and time on the
SmartServer and it includes an astronomical position sensor that determines the position of the sun
based on the time and location of the SmartServer. You can use this information to schedule events
based on the sunrise and sundown times calculated by the astronomical position sensor.
Each Event Scheduler can update multiple data points. For example, you can create several Event
Schedulers for a single building: one to control heating, one to control lighting, and so on. This
flexibility allows you to set schedules that meet the requirements of a wide range of different
applications.
You can create up to 40 Event Schedulers per SmartServer if you are using the default SmartServer
v12 static interface. You can add more than 40 Event Schedulers if you activate the v40 dynamic
interface, which features a dynamic external interface, on your SmartServer. See Activating the
SmartServer V40 XIF in Chapter 3, Configuring and Managing the SmartServer, for more information
on loading the V40 interface on the SmartServer.
Creating an Event Scheduler
To create an Event Scheduler, follow these steps:
1. Plan your schedule. For example, “On weekday mornings at 6:00 AM the heating system will be
started and the thermostat set to 65°. At 8:00 AM, the thermostat will be set to 70°.” See the next
section, Planning Your Schedule, for more information.
2. Configure the SmartServer’s real-time clock if you plan on creating sunrise and sundown events.
3. Open an Event Scheduler application.
4. Select the data points to be updated by the Event Scheduler.
5. Create the daily schedules by editing the daily schedules (selecting which days use a daily
schedule) and creating events.