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Decoding Tachometer Signals Using CompactRIO/LabVIEW FPGA

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Filename: tachometer_82.zip
Requirements: View

Filename: tachometer.zip
Requirements: View

Tachometers are widely used in industrial applications to measure the angular speed of rotating machinery. This example acquires a tach sensor signal and converts it to an RPM value with the help of a FPGA VI and Real Time Host VI. The output of a tach sensor is a distorted AC waveform, with each peak value representing the teeth of a rotating shaft. The acquisition of this waveform and the calculation of time interval between successive rising edges are done on the FPGA. The Real Time host VI will then take the time interval and convert to an RPM value.

In this example, a PXI-7811R was used along with a CompactRIO R Series Expansion chassis and cRIO-9215 analog input module. You could also use this code with any CompactRIO embedded system or other CompactRIO high speed analog input modules. Simply open the Tach RPM_FPGA.vi, configure the hardware for CompactRIO, and recompile the FPGA VI.

Please refer to the application note Decoding Tachometer Signals Using CompactRIO and LabVIEW FPGA  for detailed description of a typical tachometer CompactRIO system and explanation of the block diagram.

Requirements


Filename: tachometer_82.zip

Software Requirements


Application Software: LabVIEW Full Development System 8.2
Toolkits and Add-Ons: LabVIEW FPGA Module 8.2
Language(s): LabVIEW

Hardware Requirements


Hardware Group: Reconfigurable I/O (RIO)
Driver: NI-RIO 1.3

 
Filename: tachometer.zip

Software Requirements


Application Software: LabVIEW Professional Development System 7.1
Toolkits and Add-Ons: LabVIEW FPGA Module 1.1, LabVIEW Real-Time Module 7.1

Hardware Requirements


Hardware Group: Reconfigurable I/O (RIO)

 
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