I created a VI and my purpose is to log data each time the loop is executed. SO far I only learned to write binary file...I wish I could write numeric value directly.... The only problem is I dont if my method is correct because I am afraid that each time the loop is executed, the previous binary data will be overwritten... I dont want that happen. Do you think my logic is proper in terms of logging data? Thank you!

Your logic is fine. You won't overwrite data because the file pointer will move as your data is written. If your program stops and then you start it again, and you want data to be appended to the file, you can use the set file position VI and set the pointer 0 bytes from the end. Set this position one time, after you open the file (so outside the loop) and then data will be appended. If what you mean by "write a number directly" is write something in a human redable format, you can use write to text file instead of write to binary file. Then use either the format string VI or number to fractional string VI to convert your double to a string and write it.

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is this a correct way to write data each time the loop is excuted?

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after going through some trial, it's the index array that can do the job ! and I get the last value 🙂 finally,

Now I can implement DAQ 🙂

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is this a correct way to write data each time the loop is excuted?

Re: is this a correct way to write data each time the loop is excuted?