BACnet Analog Output
 I/O Points microblock

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The BACnet Analog Output microblock sends a value from the control program to a physical output on the device and makes this value available to other BACnet devices on the network.
Any BACnet device on the network can read or change the value of this output as long as the device uses a priority higher than 16 (or, if the lock parameter is set to Y, a priority higher than 8).
The value appears to other BACnet devices as the Present Value property of a BACnet Analog Output Object. You can assign a name to each output, which appears on the face of the microblock and is used as the name of the BACnet object.
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Properties
Property
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Notes
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RefName
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Use the default reference name unless you want a more descriptive name for this microblock for graphics, source tree rules, or network links. All reference names in a control program must be unique.
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Network Visible?
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When you set Network Visible? to Yes, the microblock's output is visible to third-party equipment.
Any BACnet device on the network can read or change the value of this output as long as the device uses a priority higher than 16 (or, if the lock parameter is set to Y, a priority higher than 8).
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(Display) Name
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The microblock label used in the interface. You can use any characters (including spaces) in this field, except for the " character.
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Description
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BACnet-visible description of the microblock.
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Expander
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Indicates the number of the expander module (normally 0-5 or 0-6). The Technical Instructions document for your hardware device or the Technical Handbook can provide you with guidelines for determining the Expander. These settings can be adjusted on the Properties page; however, these settings should not need to be adjusted after the initial installation unless the input point on the device is changed.
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Output Type
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Set Output Type to match the equipment output type the microblock will read.
Binary
- Relay/Triac Output
- Pneumatic 064 PSI
Analog
- Electrical 010 Volt
- Pneumatic 064 PSI
Electrical 020 mA
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Output Number
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Set the Output Number to match the equipment input number the microblock will read.
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Sensor Type
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Sensor Type allows you to set whether or not translation will be used, and if so, what type.
- No Translation
- Linear Full RAnge
- Linear w/ offset, 420 mA
- Thermistor, Precon TypeII, 10k@77 deg F
- Thermistor Precon TypeII, 10k@25 deg C
- Non-Linear, Custom Table 1
- Non-Linear, Custom Table 2
- Non-Linear, Custom Table 3
- Setpoint adjust slide pot, -1 to +1
- Setpoint adjust switch (-1, 0, +1)
- Linear 315 PSI
- Linear w/ offset, 210 Volts
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Units
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The Units field has two parts, a scrolling list and a number field. If the unit of measure that you need is not available in the scrolling list, enter a BACnet number in the number field. Units can be read directly from the BACnet object but setting this property in the microblock reduces network traffic.
Units, abbreviations, and BACnet numbers
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Minimum Value Maximum Value
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You can use Minimum Value and Maximum Value to set the actuator limits for the equipment.
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Resolution
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The smallest recognizable change, in engineering units, for the equipment.
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COV Increment
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The COV (Change of Value) Increment is the minimum change in the present value that will cause a microblock to send data to its COV Subscribers.
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Locked
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When you select the Lock at value checkbox, WebCTRL will use the locked value instead of the actual value read by the control module.
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Editing Privilege
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Preset (the default Editing Privilege) indicates that each property in a microblock has an appropriate privilege assigned to it.
If you change the Editing Privilege, all the properties in that microblock are assigned to that one editing privilege, which is not always desirable.
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Alarm properties
Property
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Notes
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Potential alarm source?
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Select to make this alarm available in the alarm sources list in WebCTRL.
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Enable: Alarm
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Alarm Enabled? enables the reporting of the transition into alarm state.
Return Enabled? enables the reporting of the transition into the normal state.
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Alarm State
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Alarm State selects which binary state is the alarm state.
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Trend properties
Property
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Notes
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Enable Trend Log
Interval
Number of Samples
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Select Enable Trend Log to have the control module collect trend data. Refer to Trends in WebCTRL Help for details.
When Enabled, this microblock records its value in the control module's memory at the Interval you define. Each trend may be individually enabled and disabled, and when disabled, consumes no memory. You can also determine the Number of Samples you would like to collect.
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NOTE Alt+click any value in WebCTRL to view property details, including its expression and editing privilege.
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