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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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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0100%
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In the microblock dialog box, the 100% setting defines the maximum duration the signal should be when the value of the microblock is 100%. On the Properties page, this setting is represented as Full Scale. The 0% setting defines the minimum duration the signal should be when the value of the microblock is 0%. On the Properties page, this setting is represented as Min Pulse.
The total duration of the signal is a combination of the minimum (0%) and maximum (100%) times. The signal duration is calculated as follows, where m is the 0% setting (minimum pulse width), M is the 100% setting (maximum pulse width), and P is the percent value of the microblock:
signal duration = m + (M x P)
Example 0% = 5 sec., 100% = 40 sec., input = 25% In this example, the signal duration equals (5 sec.) + (40 sec. x .25), or 15 seconds.
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Minimum
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In the Pulse refresh time section, the Minimum setting defines how long to wait before sending a new signal. If the microblock's value changes before this time, the control program will ignore it until the minimum time expires. This value can be adjusted on the Properties page using the Min Refresh property.
NOTE The minimum refresh time must be at least as long as the total of the 0% and 100% pulse width times, or the minimum time may expire before the complete pulse has been sent.
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Maximum
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The Maximum setting defines how long to wait before sending a new signal if the percent value has not changed since the last pulse. If the value has not changed by the time the maximum time expires, the control program will send the same pulse again. This setting can be adjusted on the Properties page using the Max Refresh property. The maximum time must be longer than the minimum time. The maximum is usually obtained from the end-device manufacturer's specifications.
If the percent value changes after the minimum refresh time but before the maximum refresh time, the control program will immediately send a new pulse and reset minimum refresh time and maximum refresh time.
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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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