Technical data

List of all BACnet Properties in Native Operation • 287
Exception_Schedule
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
6.26 Exception_Schedule
Data Type BACnetARRAY[N]of BACnetSpecialEvent
Objects Scheduler
Description This property is a BACnetARRAY of BACnetSpecialEv-
ents. Each BACnetSpecialEvent describes a sequence of
schedule actions that takes precedence over the normal day's
behavior on a specific day or days.
BACnetSpecialEvent ::= (Period, List of
BACnetTimeValue, EventPriority)
Period ::= Choice of {BACnetCalendarEntry |
CalendarReference}
EventPriority ::= Unsigned (1..16)
The Period may be a BACnetCalendarEntry or it may refer
to a Calendar object. A BACnetCalendarEntry would be
used if the Exception_Schedule is specific to this Schedule
object. A calendar might be defined for common holidays to
be referenced by multiple Schedule Objects. Each BACnet-
CalendarEntry is either an individual date (Date), range of
dates (BACnetDateRange), or month/week-of-month/day-
of-week specification (BACnetWeekNDay). If the current
date matches any of the calendar entry criteria, the Excep-
tion Schedule would be activated and the list of BACnet-
TimeValues would be enabled for use.
Individual fields of the various constructs of the BACnet-
CalendarEntry may also have a "wildcard" value used for
determining if the current date falls within the Period of the
Exception Schedule. In a date range, for example, if the
startDate is a wildcard, it means "any date up to and includ-
ing the endDate. " If the endDate is a wildcard, it means
"any date from the startDate on. " If the calendar entry were
a BACnetWeekNDay with wildcard for month and week-of-
month fields but with a specific day-of-week, it would mean
the Exception Schedule would apply on that day-of-week all
year long.
Each BACnetSpecialEvent contains an EventPriority that
determines its importance relative to other BACnetSpe-
cialEvents within the same Exception_Schedule. Since Spe-
cialEvents within the same Exception_Schedule may have
overlapping periods, it is necessary to have a mechanism to
determine the relative priorities for the SpecialEvents that
apply on any given day. If more than one SpecialEvent ap-