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Analog Output BACnet Objects

AO - Analog Output Object Description (Analog Output: 0-5)

Each of the analog outputs in all types of modules is represented on the BACnet network as the BACnet Analog Output object with the following properties.

Dynamically creatable: no, dynamically deletable: no.

Property Name

Required

Proprietary

Writable

Property ID

Data Type

Description

OBJECT_IDENTIFIER

Yes





From AO:0 to AO:5

OBJECT_NAME

Yes





AO-x

OBJECT_TYPE

Yes






PRESENT_VALUE

Yes


Yes



PRESENT_VALUE property

STATUS_FLAGS

Yes





STATUS FLAG property

EVENT_STATE

Yes






OUT_OF_SERVICE

Yes


Yes



OUT OF SERVICE property

UNITS

Yes






PRIORITY_ARRAY

Yes


Yes




RELINQUISH_DEFAULT

Yes


Yes




COV_INCREMENT

no


Yes



COV INCREMENT property

OUTPUT_TYPE *


Yes

Yes

4001

Enumerated


HAND_STATUS*


Yes


3014

Boolean


HAND_VALUE*


Yes


3015

Enumerated


Properties of the Analog Output object

Note: Additional properties of the object are saved to maintain the backward compatibility with the older firmware version. In the new firmware version, each of the properties has a corresponding BACnet object.

PRESENT_VALUE Property

The property contains the voltage value, expressed in mV or percentage, of the analog output PWM duty cycle. The output operation mode and property units are defined by the AO_CONFIGURATION object.

COV INCREMENT Property

In the firmware versions above 4.0, MIX and MINI modules support COV (change of value), which means that the module automatically sends the analog output value if it changes more than the COV Increment property value (for IP modules this value can also be changed in the  module’s web page).

OUT OF SERVICE Property

For the analog output, the OUT OF SERVICE object property is set to true if the output is overridden by the USB connection or in the module’s web page (only in IP version). The OUT OF SERVICE is set to false if the Present Value property is set by the BACnet message.

STATUS FLAG Property

The STATUS FLAG property contains information about the status of the object. This property consists of 4 binary flags. Each flag is described in the table below.

Module Inputs

Results

AO Potentiometer

Priority Array

Present Value

Analog Output

Status Flag Property

Auto position

NULL

Default

Default

0000

ANALOG VALUE

ANALOG VALUE

ANALOG VALUE

Manual position

NULL

Manual Value

Manual Value

0010

ANALOG VALUE

Manual Value

STATUS FLAG property changes

AO CONFIGURATION Object (Multistate Value: 17-22)

The object contains information about the mode of the analog output according to the following table (changing configuration also has an impact on the analog output unit property):

Object Value

Description

Unit Property

1 (default)

Voltage output 0–10 V

mV

2

PWM 1 Hz

%

3

PWM 10 Hz

%

4

PWM 100 Hz

%

5

PWM 0.1 HZ

%

6

PWM 0.01 Hz

%

The AO Configuration object value list

This configuration is also available in the AO Analog Output object as the OUTPUT_TYPE property 4001.

AO HAND_STATUS Object (Multistate Value: 23-26)

The object contains state of the hand status operation according to the table below:

Object Value

Description

1

AUTO

2

HAND_ON

The AO Hand Status object value list

This information is also available in the AO Analog Output object as the HAND_STATUS property 3014.

WARNING!

This object is available only in the MINI 4U4A-H and 4U4A-H-IP modules.

AO HAND_VALUE Object (Analog Value: 22-25)

The object contains the percentage value (0-100%) of hand. This information is also available in the AO Analog Output object as the HAND_VALUE property 3015.

WARNING!

This object is available only in the MINI 4U4A-H and 4U4A-H-IP modules.

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