National Instruments NI 5670 用户手册

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NI RF Signal Generators Getting Started Guide
Figure 16.  Enclose niRFSG Check Generation Status VI in the While Loop
17. Right-click the While Loop tunnels and select Replace with Shift 
Register.
18. Select the Unbundle by Name primitive on the Functions»
Programming»Cluster & Variant palette. Place the primitive inside 
the While Loop.
19. Wire the error out terminal of the niRFSG Check Generation Status 
VI to the Unbundle by Name primitive.
20. Wire the output terminal of the status element to the Loop Condition 
terminal of the While Loop using a logical Or gate.
21. Right-click the unused input terminal of the Or gate and select 
Create»Control to create a STOP button on the VI front panel. 
The portion of the block diagram resulting from steps 18 throug21 
is shown in Figure 17.
Figure 17.  While Loop with STOP Button
Complete steps 22 and 23 to add an error indicator to the VI front panel.