Using the scan Mode 9411 cRIO-9074

Hello

I use an entrance Module differential differential NI9411 under cRIO-9074 with scan Mode, but I noticed that some problems are present.

My application needs two encoder and we choose two incremental encoders with 1024pulses/rev. I have configured the NI9411 quadrature Mode, so I can read the position and speed of the encoder. Each shaft turn at different speeds.

One of them can turn 4.6 rad/s as a maximum speed, while the other hit it up to 402 rad/s. Then, the configuration of the module input filter is set to 1microsed, the time base speed 32768 microseconds and the disabled index mode. These values make for a correct reading? The cRIO scanning speed is set to 1ms.

On the other hand, watching the tutorials or (http://zone.ni.com/devzone/eda/tut/p/id/7109), that the degree of rotation depends on the encoding type, what type of encoding is used in Scan Mode? X 4?

Using System Manager OR distributed, one of the encoders to read impulses sometimes sporadic (up to 2 digits) Although the encoder is stopped. However, the other bed is always 0. It seems that the encoder is broken, isn´t it?

Thanks in advance for your comments

Hi Juancar,

I think that the values are suitable. The issue of reading 0 is explained in this KB:

http://digital.NI.com/public.nsf/allkb/C9088DFDF803CD8B862575F3007C40FD?OpenDocument

In addition, according to this document:

http://zone.NI.com/DevZone/CDA/tut/p/ID/7338

decoding type must be set to X 4.

I hope this helps! Suerte con ello.

Jesus

Tags: NI Software

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