Technical data
BACnet/IP Controller 750-830 • 153
BACnet Building Controller (B-BC)
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
3.1.12.2.3 Binary Input Object
The Binary Input object defines a standardized object whose properties repre-
sent the externally visible characteristics of a binary input. A "binary input" is
a physical device or hardware input that can be in only one of two distinct
states. In this description, those states are referred to as ACTIVE and
INACTIVE. A typical use of a binary input is to indicate whether a particular
piece of mechanical equipment, such as a fan or pump, is running or idle. The
state ACTIVE corresponds to the situation when the equipment is on or run-
ning, and INACTIVE corresponds 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 when the relay is energized, while a normally
closed relay contact may result in an INACTIVE state when the relay is ener-
gized. The Binary Input object provides for this possibility by including a Po-
larity property.
The Binary Input Object and its properties are summarized in Tab. 3-30. The
properties are described in section 6.
Tab. 3-30: Properties of the Binary Input Object
Property Data type: Default Value Writable via BACnet by
means of
Object_Identifier BACnetObjectIdentifier - -
Object_Name CharacterString Binary_Input_X -
Object_Type BACnetObjectType BINARY_INPUT -
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 -