### BACnet Modeled Binary Output The information below provides a FULL description of this microblock and all of its properties. What information you see and what you can do with it depends on your license and the application you are in, and in some cases, a controller's driver version.
Microblock family | Display microblocks
Icon and symbol |
What it does | This microblock reads the properties from a BACnet Binary Output object in any BACnet device on the network and makes these values available in the WebCTRL® or Field Assistant system. The link to the device is established in SiteBuilder. The link to a specific BACnet object in that device is the Object Instance setting described below. A Display microblock is most often used to display information from other vendor's equipment on Graphics and Properties pages. The operator can then read and write to the equipment as appropriate. This microblock can be used to import multiple properties from a single object, but to prevent unnecessary network traffic you should import only properties that are actually needed for the intended task. Use the checkboxes in the Present column to select which properties to get.
Click for details below Properties Alarms
#### Properties TIPS Alt+click any value in the WebCTRL® or Field Assistant interface to view property details, including its editing privilege and expression (location path) for use on graphics. You can right-click some properties in the EIKON® Property Editor and select Make editable or Make read-only to determine that property's functionality in your system.
Display Name | The microblock label used in the EIKON® application and the WebCTRL® interface. You can use any characters except the " character.
Reference Name RefName | Use the default reference name unless you want a more descriptive name for graphics or network links. Limitations: lower case only limited to 40 characters cannot begin with a number must be unique within a control program
Description | (optional) A BACnet-visible microblock description.
Editing Privilege | Preset - Each microblock property has an appropriate privilege or role assigned to it. You can use Global Modify in the WebCTRL® interface to find out what the actual privilege is. CAUTION If you change the Editing Privilege from Preset, the privilege you select will be used for all properties of this microblock, which is not always desirable.
Inactive Text | The Inactive Text your system displays when the microblock's output is off, or false.
Active Text | The Active Text your system displays when the microblock's output is on, or true.
Object Instance | The instance number (0 to 4,194,303) of the BACnet object you are linking to.
Device Alias | This field represents the address of the BACnet device from which this microblock will retrieve its values. You can type the Device Instance of the BACnet device or the Device Alias character string defined in a Device Alias microblock. If you leave this field blank, the system will use “this” in the Display microblock’s BACnet address and retrieve this microblock’s values from the device to which the microblock’s control program is attached in SiteBuilder.
Show Property Page Text | Check to show this microblock's value on the equipment's Properties page.
Supports Locked Value | Allows the BACnet object to be locked to a specific value in WebCTRL® or Field Assistant and held at that value until unlocked. The locked value takes precedence over any priority array value.
BACnet object properties | Select the checkbox in the Present column to show the BACnet object property on the WebCTRL® or Field Assistant Properties page. Properties that do not have a checkbox in the Present column are always shown. CAUTION If you select a property that is not in the BACnet device, you will get an error in WebCTRL® or Field Assistant. Select the checkbox in the Write to Field column to make the property editable from the WebCTRL® or Field Assistant Properties page. CAUTION If you select Write to Field for a property that is read-only in the BACnet device, you will get an error in WebCTRL® or Field Assistant.
The following properties are always present. See the ANSI / ASHRAE Standard 135 for a description of additional properties that can be enabled in EIKON® for WebCTRL.
Object Name | An alpha-numeric string that is unique within the BACnet device.
Present Value | The current value of the BACnet object.
Out of Service | Lets you stop the BACnet object from writing to the physical sensor's value so that you can override the logical value in the BACnet device by changing the Present Value in WebCTRL® or Field Assistant.
Polarity | If normal polarity, the BACnet object's value is the same as the physical sensor's value. If reversed polarity, the object's value is the opposite of the physical sensor's value.
Priority Array | BACnet objects can be written to by more than one source. Each source writes at a specified priority, with a higher priority overriding a lower priority. The lower the priority number (1–16), the higher the priority. On this microblock's Properties page in the WebCTRL® or Field Assistant interface, the Priority Array table shows the current value for each priority. If the present value is editable, you can change it and set the priority in the Command priority for writing field. To clear a value in the Priority Array table, delete or select Null in the Present Value field. In the Command priority for writing field, select the priority whose value you want to clear. Then click Accept.
Relinquish Default | The default value used for the present value when no values have been written at any priority.
Status flags | If this microblock is enabled as a potential alarm source, this will show Status checkboxes on the Alarms > Enable/Disable tab that indicate the current alarm status of the BACnet object.
Event state | If this microblock is enabled as a potential alarm source, this will show the current alarm state (Normal, Offnormal, Fault) of the BACnet object on the Alarms > Enable/Disable tab.
Object ID | A combination of the Object Type and the Object Instance number.
Address | The address of the BACnet object that this microblock references.
#### Alarms
Potential alarm source | Check to make this microblock available in the system's Alarm Sources list.
Critical | Determines the color of the system-wide alarm button when the alarm comes in if the alarm's Template field is set to Universal. = Critical = Non-critical
Category | The category you want to use to filter this microblock's alarms on the system's Alarms page > View tab.
Template | Universal - Allows your system to use the Alarm text and Return text defined in the microblock, and the Critical checkbox to determine the color of the system-wide alarm button when the alarm comes in.
Alarm
Alarm text | The message displayed on the WebCTRL® Alarms page > View tab when an alarm condition occurs. A relative path is useful for alarm messages that you will reuse in multiple WebCTRL® locations because the path is relative to the item that contains the path.
Return to Normal
Return text | The message displayed on the WebCTRL® Alarms page > View tab when an alarm condition returns to normal. A relative path is useful for alarm messages that you will reuse in multiple WebCTRL® locations because the path is relative to the item that contains the path.