Read encoder signal with 9201

[Yves]

Hi

I have a quite uncommon problem. I need to acquire the encoder signal with a NI-9201 (analogue module).

Is this even possible? Of course I saw I that I should use a NI-9401 but my chassis is full...

I already tryed to acquire impulse signals with such a module but they were slower.

Thanks for any help.

Yves

[MaveenD]

Hi Yves ,

Maybe did you try with different method without the DAQ assitant?

[Yves]

Hi Maveen

Yes, I already did some kind of measurement without DAQ assistant. And it worked. But I'm not sure it'll work with an encoder signal which has a higher frequency.

[Philipp_Kost]

Hi Yves,

when you acquire data from an encoder, do you mean a quadrature encoder or rotary encoder?

This encoder generates a binary or digital signal.

Of course, you can always acquire a digital signal with an analog input module. This isn't recommended and necessary when you can use a pre-built api in the palettes for digital modules.

When there is no free slot you can think about an expension chassis or a single carrier. This depense on your application.

How did you acquired the slower signal until now?

Kind Regards,

Philipp K. | NI-Germany

[Yves]

Hi Philipp

Thank you for your help.

The encoder generates a rotary signal (A-Phase, B-Phase). The signal itself has sinusoidal with 5 VDC peak.

Well, I haven't evaluated the possibility of an additional single carrier. Actually the system is built up with a cDAQ 9172. Maybe I should consider this too.

The last time I acquired turbine signal (approx 200Hz) I did this with a analogue channel. The I processed the signal by using two triggers (one for rising and one for falling). This gives me absolutely accurated values.

Yves

[Philipp_Kost]

Hi Yves,

can you attach any VI or screenshots.

Regards,

Philipp