User Manual

Calendars and schedulers
Schedule
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● Switch value exception schedule:
If an active switch value exists for a specific time, the exception schedule determines the resulting
Present_Value.
● Daily profile switch value:
If an active switch value from a daily profile exists for a specific time, the daily profile determines the
resulting Present_Value.
● Default value switch value:
If no active switch value from the exception schedule and the daily profile exists at a specific time of
day, the default value determines the resulting Present_Value.
Exception schedule [EcptSchd]
Exception profiles
The exception schedule [EcptSchd] overwrites some or all of the daily switching operations in a weekly
schedule [WeekSchd]. It consists of one or more profiles (max. 20).
Each profile has a:
● Date
● Specified time
● Priority
● Value for the output signal
The exception schedule may be a time range, including multiple days.
Activating exception profiles
Depending on the customer's requirement, the date on which an exception profile is to be activated can be
defined either in the time schedule itself, or in the standard BACnet object Calendar. In the latter case, the
calendar object is linked to the time schedule via BACnet references.
An exception begins with the first time entry and ends with the last. Each profile may contain up to 20
switch times.
Setting priorities
The switch value of all current profiles is continuously monitored for present priorities. The priorities
determine which switch value is transferred to the [PrVal] output. The system evaluates every minute if a
day or an exception profile should be active. Each profile of the exception schedule is assigned a priority
level from 1 (highest) to 16 (lowest). If several exceptions are valid at the same time, the profile with the
highest priority is processed.
If multiple switch values from different exceptions with the same priority exist at a specific time, the active
switch value of the exception with the lowest array index (from the exception schedule) determines the
exception switch value. The procedure is the same as the procedure for various priorities. The array index
is used as a sub-priority. Exceptions with different priority levels however, are independent of each other.
That's why it is preferable to assign different priorities to exceptions defined in the schedule.