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Digital Output BACnet Objects

BO - Digital Output Object Description

Each of the digital outputs in all types of modules is represented on the BACnet network as the BACnet Binary 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 BO:0 to BO:12

OBJECT_NAME

Yes





BO-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

POLARITY

Yes






PRIORITY_ARRAY

Yes


Yes




RELINQUISH_DEFAULT

Yes


Yes




HAND_STATUS *


Yes


3014

Enumerated


Properties of the Digital 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 property has a corresponding BACnet object.

PRESENT_VALUE Property

The property contains the actual value of the digital output. If the DO is in the hand mode, the actual value of the DO is stored in both PRESENT VALUE property and HAND_STATUS object.

Digital Output COV

In the firmware versions above 4.0, MIX and MINI modules support COV (change of value). It means that the module automatically sends the digital output value with every change.

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 Input

Results

DO Switch

Priority Array

Present Value

Digital Output

Status Flag Property

Auto position

NULL

Default

Default

0000

BINARY VALUE

BINARY VALUE

BINARY VALUE

Manual position
ON

NULL

TRUE

ON

0010

BINARY VALUE

Manual position
OFF

NULL

FALSE

OFF

0010

BINARY VALUE

STATUS FLAG property changes

OUT OF SERVICE Property

For digital outputs, the OUT OF SERVICE property is set to true if the output is overridden by the USB connection or from a module web page (only in IP version). In such case, the OUT OF SERVICE is set to false if the Present Value property is set by the BACnet message.

HAND_STATUS Object (Multistate Value: 23-26)

The property stores information about the status of the hand operation switch and the status of the DO in the hand mode, according to the table below:

Value of Hand Status

Status Description

1

AUTO-OUT=OFF

2

AUTO-OUT=ON

3

PWM

4

HAND-OUT=OFF

5

HAND-OUT=ON

The HAND STATUS object value list


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