Analog Output (AO) points receive variable commands from the automation station. Examples of AO points include:

  • Valve or damper actuators
  • Variable speed drives

BACnet Property

Short Name

BACnet Description

Notes

object-type

ObjTyp

Object type

Value: 1 (analog-output)

profile-name

PrfNam

Profile name

Value: 7-003-SBCv15.03

Prototype

BAObjTyp

Building automation profile

Value: 3 (AnalogOutput)

present-value

PrVal

Present value

A writable standard BACnet property that indicates the current value, in engineering units, of the logical output.

priority-array

PrioArr

Priority array

A read-only standard BACnet property that contains prioritized commands that are in effect for this object. A BACnetPriorityValue may be a REAL value or null.

Present-Priority

PrPrio

Present priority

A read-only proprietary property that indicates the highest priority slot (1-16) in the priority-array with a non-null value. If all slots in the priority array are null, DS1_Present-Priority shall have the value 17.

relinquish-default

DefCmd

Default command

A writable standard BACnet property that provides the default value for present-value property when all slots in the priority-array are null.

Tracking_Value

TckVal

Tracking value

A read-only proprietary property that indicates the value that has been written to the physical output, regardless of whether the output is commanded, decoupled via the out-of-service property, or physically overridden by external hardware.

units

Un

Units

A writable standard BACnet enumerated property that indicates the measurement units of this object.

resolution

Rsl

Resolution

A writable standard BACnet property that specifies indicates the smallest recognizable change in present-value in engineering units.

max-pres-value

PrValMax

Present maximum value

A writable standard BACnet property that indicates the highest number in engineering units that can be reliably used for the present-value property of this object.

min-pres-value

PrValMin

Present minimum value

A writable standard BACnet property that indicates the lowest number in engineering units that can be reliably used for the present-value property of this object.

cov-increment

Cov

Change of value, COV

A writable standard BACnet property that specifies the minimum change in present-value that will cause a COV Notification to be issued to subscriber COV-clients.

Alarm-Extension

AlarmExtn

Event configuration

A writable enumerated proprietary property that specifies whether the optional intrinsic alarming extension is enabled for the object.

Aggregation-Extension

AggtnExtn

Aggregation: Operating hours & others

A writable enumerated proprietary property that allows an optional aggregation extension to be enabled for the object.