### Timed Local Override 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 | Reads a local override input signal from a user-adjustable switch or button in the zone. Converts the signal, then outputs a remaining time value. This value can be used by a time clock microblock to indicate a change in occupancy status.
Click for details below How it works Limitations Configuration example Properties Alarms Trends Simulation
#### How it works Each time the user presses the button or switch that is assigned to this input, the input senses a binary signal. The microblock converts this binary input signal, or pulse, into a time output (minutes) using one of 3 methods you choose and set up.
Method | Description
Pulse Input | Pulses counted x Each pulse = Present Value Present Value accumulates up to Maximum Value. You can define a reset signal for the user in the Cancel override if input closed for > ___ seconds field.
Fixed Width Input | Pulse sensed x Each pulse = Present Value No accumulation with multiple pulses. No reset signal.
Mechanical Input | Override enabled by a constant-signal device such as a wind-up timer. Signal sensed x Input closed = Present Value
#### Limitations Maximum Value cannot exceed 546 minutes.
#### Configuration example
#### 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.
Units | The unit of measurement of the microblock's present value. Select from the BACnet engineering units in this droplist. For some microblocks, you can customize the droplist by selecting Options > Preferences > Droplist Options.
Hardware Configuration
Expander | The address of the expander (1 to 6) that has the physical input this microblock reads. Type`0` for a physical input on a controller without an expander.
Input Number | The number of the physical input the microblock reads.
Input Type | The type of equipment wired to the input number that the microblock reads. Universal Input - Provides backwards compatibility with drivers earlier than v2.02.022. With later versions, this selection displays a ? value in the WebCTRL® or Field Assistant system.
Override Type and Setup
Pulse Input, Mechanical Input, or Fixed Width Input | Select the method the microblock uses to convert the controller's binary input signal into a time value (minutes). See "How it works" in this microblock's help.
Each pulse | Minutes the microblock adds to the zone's occupied time for each press of the zone's local override button or switch.
Cancel override if input closed for > ___ seconds | Seconds the user must press the local override button to cancel timed local override and return the zone to the unoccupied mode.
Input Closed | Minutes the microblock adds to the zone's occupied time for each press of the zone's local override button or switch.
Maximum Value | Maximum value (up to 546 minutes) the microblock outputs regardless of additional pulses from the controller's input.
Resolution | The increment by which the microblock updates the value on its output wire in the WebCTRL® or Field Assistant system. The Resolution format is used to truncate the microblock’s actual value. For example, if you enter a value from: 0.1 to 0.9, the wire displays 1 digit to the right of the decimal 0.01 to 0.99, the wire displays 2 digits to the right of the decimal 1 or greater, the wire displays a whole number The Resolution value determines the increment by which the present value is updated. For example, if you enter: .2, the wire displays 8.4, 8.6, 8.8, ... .03, the wire displays 5.09, 5.12, 5.15, ... 10, the wire displays 30, 40, 50, ...
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.
COV Increment | An Analog Network Input (ANI) that references this microblock in its Address field tries to subscribe to this microblock's COV (Change of Value) service. If subscription succeeds, the ANI receives a value from this microblock only when this microblock's present value changes by at least the COV Increment. If subscription fails, the ANI reads this microblock's value at intervals specified in the ANI's Refresh Time field.
Out Of Service Minimum Pres Value Minimum Value | If a third-party vendor sets the microblock's BACnet Out_Of_Service property to True and then he writes a value lower than this value to the microblock's Present_Value, the controller returns a Property, Value_Out_Of_Range error.
Show Property Page Text | Check to show this microblock's value on the equipment's Properties page.
#### 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
Low Limit Enable | Check to send an alarm when the microblock's present value remains below the Low Limit value for the defined Delay Seconds.
Low Limit | The value the microblock's present value must drop below to send an alarm.
High Limit Enable | Check to send an alarm when the microblock's present value remains above the High Limit for the defined Delay Seconds.
High Limit | The value the microblock's present value must rise above to send an alarm.
Dead Band | The amount inside the normal range by which an alarm condition must return before a return-to-normal notification is generated. EXAMPLE
Delay Seconds | The time the microblock's present value must remain in an alarm condition before the microblock sends an 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.
Alarm requires acknowledge | Check to require that an operator acknowledge alarm notifications on the system's Alarms page > View tab.
Return to Normal
Return Enabled | Check to send a message when an alarm condition has returned 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.
Return requires acknowledge | Check to require that an operator acknowledge return-to-normal notifications on the system's Alarms page > View tab.
Fault
Fault Enabled | Check to send a message when a fault condition occurs, such as a misconfigured or non-existent sensor.
#### 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 by at least the COV Increment.
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. NOTE 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.
#### Simulation Define the value(s) the microblock will use when you simulate the control program.