Technical data
BACnet/IP Controller 750-830 • 155
BACnet Building Controller (B-BC)
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
3.1.12.2.4 Binary Output Object
The Binary Output object defines a standardized object whose properties rep-
resent the externally visible characteristics of a binary output. A "binary out-
put" is a physical device or hardware output that can be in only one of two dis-
tinct states. In this description, those states are referred to as ACTIVE and
INACTIVE. A typical use for a Binary Output is the switching of a mechani-
cal device, for example a ventilator or a pump. The state ACTIVE corresponds
to the situation when the equipment is on or running, and INACTIVE corre-
sponds to the situation when the equipment is off or idle.
In some applications, electronic circuits may reverse the relationship between
the application-level logical states ACTIVE and INACTIVE and the physical
state of the underlying hardware. For example, a normally open relay contact
may result in an ACTIVE state (device energized) when the relay is energized,
while a normally closed relay contact may result in an ACTIVE state (device
energized) when the relay is not energized. The Binary Output Object pro-
vides for this possibility by including a Polarity property.
The Binary Output Object and its properties are summarized in Tab. 3-31. The
properties are described in section 6.
Tab. 3-31: Properties of the Binary Output Object
Property Data type: Default Value Writable via BACnet
by means of
Object_Identifier BACnetObjectIdentifier - -
Object_Name CharacterString Binary_Output_X -
Object_Type BACnetObjectType BINARY_OUTPUT -
Present_Value BACnetBinaryPV - -
Description CharacterString *see footnote WriteProperty
Device_Type CharacterString ' ' WriteProperty
Status_Flags BACnetStatusFlags '000' -
Event_State BACnetEventState State_Normal (0) -
Reliability BACnetReliability 0 WriteProperty
Out_Of_Service BOOLEAN '0' -
Polarity BACnetPolarity 0 WriteProperty
Inactive_Text CharacterString "inactive" WriteProperty
Active_Text CharacterString "active" WriteProperty
Change_Of_State_Time BACnetDateTime UNSPECIFIED -
Change_Of_State_Count Unsigned 0 -
Time_Of_State_Count_Reset BACnetDateTime UNSPECIFIED -
Elapsed_Active_Time Unsigned32 0 -
Time_Of_Active_Time_Reset BACnetDateTime UNSPECIFIED -
Minimum_Off_Time Unsigned32 1 WriteProperty