scan with ni9401 mode

Hello, I use the scan mode and the module ni9401, and I'm under codes in labview with a timed loop

When I try to change the loop timed to dt = microsec and scan period<1ms in="" compact="">

Compact rio is disconnected! why I got this problem?

Maybe I can use scanning with scan time mode<>

Hi, mariomoskis,

Unfortunately, this is part of the limitation of the scan Mode. You can basically think of scan mode as a train that toured all the modules collects data and it falls on the drive and there is only 1 train for the entire system and it runs at a speed (scanning speed). The fact train one passes each interval of scanning speed, so if you want to produce a train of pulses to a little less than 1 kHz you will get aliasing. However, cRIO should unplug any, I don't know what the problem is here, but it seems closely related.

There are two solutions to this problem, but the two would require changes.
1. you can avoid all these problems and the resolution time get down to a 25ns (or less) If you set the mode FPGA. We can use the existing code of NI.com/IPnet to implement a pulse generator to train with the custom calendar settings and pulse on any module.

2. some modules support digital modes specialized, making essentially a pre-built section of the FPGA code (in scan mode) that support some common functions such as Pulse Width Modulation. With these modules, you can request a rate (which will update at 1 kHz)-specific, but the actual timetable for the module is managed at the hardware level. There are only a few modules that support it, and they are listed in the link below.

KB 55L06EMO: what Support Modules of the series C, specialty digital functions in Scan Mode?
http://digital.NI.com/public.nsf/allkb/2664A3D35D9F79A4862576B300277E35?OpenDocument

I hope this helps.

Saludos!

Jesus

Tags: NI Hardware

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