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BACnet - What is a BACnet Pulse Converter object

The Pulse Converter object is described by the BACnet standard as a process monitor represented by counts or pulses.

The type of processes monitored can include those tasks necessary to maintain a building, such as the following examples:

  • Power Usage
  • Water Usage
  • Natural Gas Usage

The Pulse Converter object might represent a physical input. As an alternative, it might acquire the data from the Present_Value of an Accumulator object, representing an input in the same device as the Pulse Converter object.

The following table will present the actual properties and associated datatypes of the Group object from the BACnet standard:

PropertyDatatype
Object_IdentifierBACnet Object Identifier
Object_NameCharacter String
Object_TypeBACnet Object Type
DescriptionCharacter String
Present_ValueReal
Input_ReferenceBACnet Object Property Reference
Status_FlagsBACnet Status Flags
Event_StateBACnet Event State
ReliabilityBACnet Reliability
Out_of_ServiceBoolean
UnitsBACnet Engineering Units
Scale_FactorReal
Adjust_ValueReal
CountUnsigned
Update_TimeBACnet Date Time
Count_Change_TimeBACnet Date Time
Count_Before_ChangeUnsigned
COV_IncrementReal
COV_PeriodUnsigned
Notification_ClassUnsigned
Time_DelayUnsigned
High_LimitReal
Low_ LimitReal
DeadbandReal
Limit_EnableBACnet Limit Enable
Event_EnableBACnet Event Transition Bits
Acked_TransitionsBACnet Event Transition Bits
Notify_TypeBACnet Notify Type
Event_Time_StampsBACnet Array (3) of BACnet Time Stamp
Profile_NameCharacter String


The developer should pay close attention to a specific property in the preceding table. The specific property is the Adjust_Value property. This property allows the developer to adjust the Present_Value property by writing to the Adjust_Value property, which also causes an adjustment to the Count property as well.

The following example from the BACnet standard will present the Pulse Converter object structure from an actual automation application. This example will specifically focus on the utility usage in a building:

Property: Object_Identifier = (Pulse Converter, Instance 1)
Property: Object_Name = "Meter 5"
Property: Object_Type = PULSE_CONVERTER
Property: Description = ""
Property: Present_Value = 125.0
Property: Input_Reference = ((Accumulator, Instance 1), Present_Value)
Property: Status_Flags = {FALSE, FALSE, FALSE, FALSE}
Property: Event_State = NORMAL
Property: Out_Of_Service = FALSE
Property: Units = LITERS_PER_HOUR
Property: Scale_Factor = 0.5
Property: Adjust_Value = 500.0
Property: Count = 250
Property: Update_Time = (10-JUL-01,11:40:21.0),
Property: Count_Change_Time = (10-JUL-01,11:30:01.0),
Property: Count_Before_Change = 523
Property: COV_Increment = 10.0
Property: COV_Period = 3600
Property: Notification_Class = 5
Property: Time_Delay = 0
Property: High_Limit = 1000.0
Property: Low_Limit = 0.0
Property: Deadband = 0.0
Property: Limit_Enable = {FALSE, TRUE}
Property: Event_Enable = {TRUE, FALSE, TRUE}
Property: Acked_Transitions = {TRUE, TRUE, TRUE}
Property: Notify_Type = ALARM
Property: Event_Time_Stamps = ((12-JUL-01,18:50:21.2), (*-*-*,*:*:*.*), (12-JUL-01,19:01:34.0))

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