BACnet Knowledgebase

Signals configuration

Abstract

With the help of a browsing function, your BACnet objects including their properties can be clearly displayed in Studio and linked to i4SCADA signals.

Further on, insert the Broker URL in the designated field and press the toolbar button New

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Add the BACnet Broker URL

As soon as button New is clicked the Properties selector pop-up dialog is displayed, containing a list of devices belonging to BACnet Broker. 

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Properties Selector

Expand the desired Devices to access the underlying Objects.

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List of Device Objects

Select an Object from the unfolded list to access the Properties of selected Object.

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Object Properties

Note

There might be the case where some Object properties are highlighted by an orange warning symbol. As the symbol tool tip indicates, those properties are not supported and cannot be imported.

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Check the Object properties list, select the desired Properties and click the Import button to add them to the Connector configuration. Properties can be imported individually or by using the Import all button. 

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Import Object Properties

Each selected Object will provide a list of Properties. Properties can vary from one Object to another.

After all desired Properties have been imported click on the Close button to return to the Connector Configuration area.  For each of the imported Property, a signal is created. The Signal Name is created based on a combination between:

  • Device Name

  • Object Name

  • Property Name

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Connector Signals

Click on Bulk Edit to open the Bulk Edit area. Here, the user can update the parameters of the selected Property signal, in an easier form. Additionally, the Property signal parameters can be individually updated, directly in the list view.

To preserve changes organised in the Bulk edit window the user needs to first click on the OK button and afterwards the Save button.

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Bulk edit

Following parameters are available:

  • Network 

  • Array index - the index of the value used by the signal if property contains an array of values. For non-array properties the value is -1. 

  • Subscription type (May be CovObject, CovProperty, Polling and ReadOnce)

    • CovObject -Will update the signal value whenever there is a change of value at the object level, greater than the subscription increment value. 

    • CovProperty - Will update the signal value whenever there is a change of value at the property level greater than the Subscription increment value. 

    • Polling - Will update the signal value using regular polling at the interval defined by the Subscription interval value

    • ReadOnce - Updates the signal value only once.

  • Subscription interval - Is defined by milliseconds and it is editable only for subscriptions of type Polling. Scope of it is to define the poll rate.

  • Subscription increment - This parameter is only used in COV subscriptions (CovObject and CovProperty). It represents the minimum value change required to update the signal value. 

  • Priority - Defines the write priority. User can define the priority from 1 to 16.

  • Description  - Allows user the possibility to introduce a customized description of the parameter.

  • Unit - Allow user the possibility to specify a unit of measure. E.g. - kW, m3 etc.

Configure the parameters as desired making sure that the Overwrite fields check-boxes are marked as TRUE. This will ensure that the new introduced values are parsed to all parameters of the selected Property Signals. 

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Updated parameters example

To proceed with i4BACnet configuration select BACnet  New Group option.

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Create new group