Carlos_89 Posted January 25, 2019 Report Share Posted January 25, 2019 Hi all, Does any one know if the Fourier Transform can be performed on an analogue input signal to the Samba PLC? Any assistance or comments would be appreciated. Quote Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted January 25, 2019 MVP 2023 Report Share Posted January 25, 2019 You can perform a Fourier Transform on any set of data. The question is what are you looking for? You've given us nothing to go on. PLC analog inputs are not high speed devices so your sample rate is going to be limited. The absolute fastest analog update time you can get on a Samba is 30 ms (33 Hz). So the highest frequency you can see is 16 Hz according to the Nyquist theorem. A Samba doesn't exactly have a lot memory and ladder is a horribly inefficient language for doing heavy number crunching. Given those two conditions I would seriously discourage you from trying to use a PLC to achieve FFT results and point you at a high-speed National Instruments data acquisition board and a copy of LabView. Joe T. 1 Quote Link to comment Share on other sites More sharing options...
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