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 |
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 | NULL | TRUE | ON | 0010 |
BINARY VALUE | ||||
Manual position | NULL | FALSE | OFF | 0010 |
BINARY VALUE |
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 |