CLAD Debugging & Troubleshooting Techniques 4

Question 1

What does a coercion dot (red/grey dot) on a LabVIEW wire terminal indicate?

Accepted Answer

An implicit data type conversion is happening between the wire type and the terminal type

Answer

Coercion dots appear when LabVIEW automatically converts data types (e.g., DBL to I32), which can cause precision loss and should be resolved by explicitly matching types.

Question 2

In the context of LabVIEW debugging, what is the Probe Watch Window used for?

Accepted Answer

Monitoring all probe values simultaneously in a single window during VI execution

Answer

The Probe Watch Window consolidates all active probes into one panel, letting you monitor multiple wire values simultaneously without switching between probe displays.

Question 3

You have a While Loop that never terminates. Which debugging approach directly reveals the current value of the stop condition terminal each iteration?

Accepted Answer

Place a probe on the wire connected to the loop stop condition terminal

Answer

Probing the wire feeding the stop condition terminal shows you the Boolean value each iteration, letting you verify if and when the stop condition becomes TRUE.

Question 4

Which LabVIEW feature allows you to disable a section of code on the block diagram without deleting it, for debugging purposes?

Accepted Answer

Diagram Disable Structure

Answer

The Diagram Disable Structure lets you wrap and disable code sections so they are not compiled or executed, useful for isolating problematic code during debugging.

Question 5

A VI's front panel indicator shows 'NaN' (Not a Number). Which of the following is the most likely cause?

Accepted Answer

An illegal floating-point operation such as division by zero or square root of a negative number

Answer

NaN is produced by IEEE 754 floating-point operations that have no defined result, such as 0/0, sqrt(-1), or inf-inf.

CLAD Practice Test

CLAD Practice Test

CLAD Debugging & Troubleshooting Techniques 4