Understand the values fixed point of a NOR-9203

I have a cRIO-9073 with a NI 9203 module. In LabVIEW FPGA, the card values are returned as a fixed point. LabVIEW chosen fixed point properties are (+/-, 21-4) that apparently offers a range of (- 3.125E - 2, 3.125E - 2, 2.98E - 8), and the current card in the range 4-20 MA with a resolution of only 16 - bit. My understanding of fixed point values is only slightly, then someone can explain to me why a 21-bit value is required for the 16 - bit acquisition data?

Hi Thoric,

Sorry, it took a while to get a response to you.   The necessary extra bits with fixed point representation are for the overflow feature.  There is more information in the link below.

http://zone.NI.com/reference/en-XX/help/371361E-01/lvconcepts/numeric_data/#FXP_overflow

I hope that this answer to your question, but if you need more help please let me know.

Kind regards

Thomas Clark

Tags: NI Hardware

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