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Configure Fixed Point Dialog Box

NI Distributed System Manager for LabVIEW 2012 Help

Edition Date: June 2012

Part Number: 372572E-01

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Requires: NI Distributed System Manager (Windows)

Click the Configure Fixed Point button on the Variable page of the Shared Variable Properties dialog box.

Use this page to configure the encoding, range, and overflow status of a fixed-point shared variable.

This page includes the following components:

  • Fixed-Point Configuration—Displays the options available for configuration of a fixed-point shared variable.
    • Encoding—Specifies the binary encoding of a fixed-point number when you want the number to conform to a certain bit size.
      • Signed—Specifies whether the fixed-point data is signed. If you select Signed, the sign bit is always the first bit in the bit string that represents the data.
      • Unsigned—Specifies whether the fixed-point data is unsigned.
      • Word length—Specifies the total number of bits in the bit string that LabVIEW uses to represent all possible values of the fixed-point data. LabVIEW accepts a maximum word length of 64 bits. Certain targets might limit data to smaller word lengths. If you open a VI on a target and the VI contains fixed-point data with larger word lengths than the target can accept, the VI contains broken wires. Refer to the documentation for a target to determine the maximum word length the target accepts.
      • Integer word length—Specifies the number of integer bits in the bit string that LabVIEW uses to represent all possible values of the fixed-point data, or, given an initial position to the left or right of the most significant bit, the number of bits to shift the binary point to reach the most significant bit. The integer word length can be larger than the word length, and can be positive or negative.
    • Range—Displays the range and delta for a fixed-point number when you want the number to conform to a specific range of possible values.
      • Minimum—Displays the minimum value for the fixed-point data range.
      • Maximum—Displays the maximum value for the fixed-point data range.
      • Delta—Displays the increment between numbers within the desired range.
    • Include Overflow Status—Specifies whether to include the overflow status of the fixed-point data. Overflow occurs when the result of an operation is outside the range of values that the output type can represent. LabVIEW allocates additional storage space to track whether the fixed-point data is the result of an operation that overflowed.

 

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