Technical data

BACnet/IP Controller 750-830 • 161
BACnet Building Controller (B-BC)
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
3.1.12.2.8 Schedule Object
The Schedule object defines a standardized object used to describe a periodic
schedule that may recur during a range of dates, with optional exceptions at
arbitrary times on arbitrary dates. The Schedule Object also serves as a bind-
ing between these scheduled times and the writing of specified "values" to
specific properties of specific objects at those times.
Schedules are divided into days, of which there are two types: normal days
within a week and exception days. Both types of days can specify scheduling
events for either the full day or portions of a day. A priority system determines
which planned event is in control at any given time.
The current state of the Schedule object is represented by the value of its Pre-
sent_Value property, which is normally calculated using the time/value pairs
from the Weekly_Schedule and Exception_Schedule properties. A default
value is used when no schedules are in effect. Details of this calculation are
provided in the description of the Present_Value property.
Versions of the Schedule Object prior to Protocol_Revision 4 only support
schedules that define an entire day (from midnight to midnight). For compati-
bility with these versions, this whole day behavior can be achieved by using a
specific schedule format. Weekly_Schedule and Exception_Schedule values
that begin at 00:00, and do not use any NULL values, will define schedules for
the entire day. Property values in this format will produce the same results in
all versions of the Schedule Object.
The Schedule Object and its properties are summarized in Tab. 3-35. The
properties are described in section 6.
Tab. 3-35: Properties of the Schedule Object
Properties Data type: Based on IEC Data
Types
Default Value Writable via
BACnet by
means of
Object_Identifier BACnetObjectIdentifier BACnetObjectIdentifier - -
Object_Name CharacterString STRING “ScheduleX” -
Object_Type BACnetObjectType BACnetObjectType SCHEDULE -
Present_Value Any ARRAY[0..10] OF
BYTE
- -
Description CharacterString STRING “” WriteProperty
Effective_Period BACnetDateRange BACnetDateRange UNSPECIFIED WriteProperty
Weekly_Schedule BACnetARRAY[7]of
BACnetDailySchedule
ARRAY [1..7] OF
BACnetDailySchedule
- WriteProperty
Exception_Schedule BACnetARRAY[N]of
BACnetSpecialEvent
ARRAY [1..7] OF
BACnetSpecialEvent
- WriteProperty
Schedule_Default Any ARRAY[0..10] OF
BYTE
- WriteProperty
List_Of_Object_
Property_References
List of BACnetDevice
ObjectPropertyReference
ARRAY [0..3] OF
BACnetDeviceObject-
PropertyReference;
- WriteProperty