### BACnet 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 | I/O Point microblocks
Icon and symbol |
What it does | Sends a binary (on or off) value from the control program to a physical digital (on or off) output on the controller.
Click for details below How it works Limitations Configuration example Properties Trends
#### How it works The Output Type, Minimum off time, Minimum on time, and Polarity together determine how the microblock converts its input value into the controller's output signal to the controlled equipment. The Output Type tells the microblock what type of physical output it is connected to on the controller. Based on the microblock's value and its Polarity, the controller converts the microblock's input value into an on or off signal to the controlled equipment. Graphics or properties pages connected to the microblock display the microblock's Active Text or Inactive Text.
Polarity | Value | Output
--- | --- | ---
Normal | true | (on) Active Text
false | (off) Inactive Text
Reversed | true | (off) Inactive Text
false | (on) Active Text
The Minimum off time and Minimum on time protect the controlled equipment by determining the minimum amount of time the microblock sends each signal to the controller, regardless of the microblock's input value.
#### Limitations Binary outputs are limited to a controller's supported power, current, or pressure rating. Some controllers allow you to configure binary outputs as normally open or normally closed. Non-configurable binary outputs are normally open. See the controller's documentation for more information.
#### Configuration example For an output sending a signal to a relay wired to binary output 2 on a controller's expander 3:
#### 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.
Lock Present Value | Check to output the locked value from the microblock instead of the microblock's calculated value.
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.
Hardware Configuration
Expander | The address of the expander (1 to 6) that has the physical output this microblock sends a signal to. Type`0` for a physical output on a controller without an expander.
Output Number | The number of the physical output that the microblock sends a signal to.
Output Type | The physical output type of the output number that the microblock sends a signal to.
Setup
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.
Polarity | Normal - The microblock's output is on when the signal to the microblock is on, and is off when the signal to the microblock is off. reversed - The microblock's output value is off when the signal to the microblock is on, and is on when the signal to the microblock is off.
Minimum off time | The minimum period (seconds) that the microblock sends an off signal to the controller, regardless of the input signal to the microblock.
Minimum on time | The minimum period (seconds) that the microblock sends an on signal to the controller, regardless of the input signal to the microblock.
BACnet Configuration
Network Visible | Check to allow other BACnet equipment to read or change the microblock's present value. Must be checked for this microblock to generate alarms.
Object Instance | Auto-assign - A BACnet Object ID is assigned by the system. Use specific value - (0–3999999) Assign a number that is unique within the controller.
Show Property Page Text | Check to show this microblock's value on the equipment's Properties page.
#### Trends
Enable Trend Log | Check to have the controller collect trend data for the microblock's present value.
Sample every ___ (hh:mm:ss) | Records the microblock's present value at this interval. EXAMPLE Type `00:10:00` to record the microblock's present value every 10 minutes.
Sample on COV (change of Value) | Records the microblock’s present value only when the value changes.
Max samples | The number of data samples the controller allocates memory for. Memory consumption is 10 bytes for each sample plus 48 bytes. For example, for 100 samples: (100 x 10 bytes) + 48 = 1048 bytes of memory The allocated memory is constant regardless of how many samples are actually recorded. If you do not enable trending, no memory is consumed. Click Reset on the Properties page in the WebCTRL® or Field Assistant system to delete all samples currently stored in the controller.
Enable Trend Historian | Check this field to archive the controller's collected trend data to the system database after every 129 data samples. NOTES You must check Enable Trend Log if you want to Enable Trend Historian. You can change Enable Trend Historian archival settings and other trend properties on the Properties page in the WebCTRL® or Field Assistant system.
Keep historical trends for __ days | This is based on the date that the sample was read. Set this field to 0 to use the system default value.
Write to historian: Every ___ trend samples Use default (45% of Max samples) | Writes all trend data in the controller to the system database each time the controller collects the specified number of samples. You can select Every __ trend samples and enter a number greater than zero and less than the number in the Max samples field, or you can select Use default. The number of trends specified must be accumulated at least once before the historical trends can be viewed.
In the WebCTRL® or Field Assistant system only: |
Stop When Full | Check this field to stop trend sampling when the maximum number of samples is reached.
Enable trend log at specific times only? | Collects trend data for the specific period of time you define in the time and date fields.
Store Trends Now | Writes all trend data in the controller to the system database without having to enable trend historian.
Trend samples accumulated since last notification | Shows the number of samples stored in the controller since data was last written to the database.
Last Record Written to Historian | Shows the number of trend samples that were last written to the database.
Delete | Deletes all trend samples stored in the database for the microblock.
BACnet Configuration | The Object Name is a unique alphanumeric string that defines the BACnet object. Although the Object Name field can be edited, it is not recommended. The Notification Class is set to 1 to receive alarms generated by Automated Logic® controllers.