National Instruments BridgeVIEW 用户手册
Chapter 13
Front Panel Object Attributes
13-4
© National Instruments Corporation
Not function (Functions»Boolean)—In this exercise, the Not function
inverts the value of the STOP button so that the While Loop executes
repeatedly until you click the STOP button. (The default state of the
button is FALSE.)
inverts the value of the STOP button so that the While Loop executes
repeatedly until you click the STOP button. (The default state of the
button is FALSE.)
Random Number Generator (Functions»Numeric)—Generates raw
data between 0 and 1 to fill the tank on your front panel. You multiply
this value by 100 to create a value between 0 and 100.
data between 0 and 1 to fill the tank on your front panel. You multiply
this value by 100 to create a value between 0 and 100.
Greater or Equal? (Functions»Comparison)—Compares the raw
data to the Limit Setting input. If the value is greater than or equal to
the limit input, a TRUE value is passed to the Case Structure.
data to the Limit Setting input. If the value is greater than or equal to
the limit input, a TRUE value is passed to the Case Structure.
Attribute Node (Pop up on the Tank terminal)— Select Create»
Attribute Node from the Tank terminal. Pop up on the attribute and
choose Select»Fill Color.
Attribute Node from the Tank terminal. Pop up on the attribute and
choose Select»Fill Color.
Color Box Constant (Functions»Numeric»Additional Numeric
Constants)—Wire this constant to define a red color to Fill Color in
the TRUE case and a blue color in the FALSE Case. Click on the
constant with the Operating tool to select the color.
Constants)—Wire this constant to define a red color to Fill Color in
the TRUE case and a blue color in the FALSE Case. Click on the
constant with the Operating tool to select the color.
Wait Until Next ms Multiple (Functions»Time & Dialog)—Wire a
numeric constant of 1000 to execute the loop every second.
numeric constant of 1000 to execute the loop every second.
5.
Run the VI. The level of the tank is compared to the Limit Setting
control. If the tank value is greater than or equal to the Limit Setting
value, the tank turns red. If the data falls below the limit, the tank
turns blue.
control. If the tank value is greater than or equal to the Limit Setting
value, the tank turns red. If the data falls below the limit, the tank
turns blue.
6.
Save the VI as
Tank Limit.vi
in the BridgeVIEW
\Activity
directory.
End of Activity 13-1.