Change the value of always the same as the previous value register

Hi all. I was banging my head against the wall for a while on it and hoping that someone can help me.

I use a USB-6008 DAQ hardware to read a rotary encoder. I pulled the rudiments of the attached VI of the forums, but I modified to work with an encoder with an index. All I'm doing is reset to the "value of the degrees to zero whenever the value of the counter (Encoder index) increases a. I thought I was good at using the shift register, since it must retain the value of the previous iteration (just before the index spent). The problem I have is that two courses to the function values ' lower to "always seem to be the same, so my 'degrees' value never resets. What Miss me?

Thank you!

PS - I need to use the meter (instead of just another digital line) because it is essential that the index value is never missed. And I know using a software based counter as this tends to miss a digital input signal here and there.

Suppose that your encoder runs at 1 rpm = 1 index pulse per second. You are turning your loop to 1000 times per second. It is not clear that the 6008 reads the line of DI and the meter that fast. The software update timed AO rate is 150 Hz, maximum. If it reads fast, get you 999 readings of 0 and a reading of 1. For 1 millisecond the degrees indicator will display 0.  On the next iteration of the loop of the< comparison="" will="" be="" true="" again="" and="" the="" shift="" register="" value="" will="" be="" displayed="" again.=""  what="" you="" need="" to="" do="" is="" to="" reset="" the="" value="" going="" into="" the="" count="" register="" to="" zero,="" not="" the="" display.=""  one="" simple="" wiring="" change="" should="" fix="">

Lynn

Tags: NI Software

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