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Hello everyone, I'm using SD functions to create a CSV file to save data such as temperature / pressure / date hour etc... and I would like to understand what the value of my MI900 means when I'm online mode. I kind of get my other operand purposes but this one is difficult to identify. Here is a screen capture for you When SB41 is activated this value turns to 24900 for a couple of seconds and then restore his previous value (here it's 14129 sometimes it's 14486 or 12200 and idk why). That's what I don't get. I'm asking you this because usually the program works very well until last time where everything kind of froze and I had to reinitialize my V130 to make it work again. Also my SD card was not full at all. Below you can see the entire subroutine when it failed to write data. Only my column titles were written on my CSV but then nothing more every minutes. Also, you must have guessed but I'm a complete beginner. The program is not even mine, but from someone who left and I'm trying to learn a bit. Anyway, I'm looking forward your support. Any suggestions will be appreciated. Thank you ! Model and software used : V130 & Visilogic 9.7.55