6602 / 6601 ctr2 stops at DIO

[Traxx]

Hi,

when I use the counter2 (ctr2) from 6601 or 6602 PCI Card and 

parallel I will use DIO then the ctr2 stops.

All other counter don't stop - why?

I Used the example VI : "Gen Dig Pulse Train-Continuous.vi" for the Counter.

Thanks

Markus

[Kevin_Price]

On a 6602, ctr 2-7 share most (maybe all?) their default io pins with DIO bits 8-31.

Generally, a pin can be used by both a counter input task and a digital input task simultaneously.
However, it cannot be used by both tasks for output simultaneously.

So, Ctrs 0-1 never conflict with DIO and DIO bits 0-7 don't conflict with counters.  All other combos require more care.

A common problem under traditional NI-DAQ was to configure the entire 32-bit digital port for output.  This should be easier to avoid under DAQmx.

Exactly what kinds of inputs and outputs do you need to perform simultaneously?


-Kevin P.

[Traxx]

I use DAQmx and not the tradditianal version.

We use out0, out2, out4, out5 and

DIO_0  to DIO15, DIO_17 to DIO_19, DIO_21 to 23, DIO_25 to 27 and DIO_29 to PFI_31

OUT0, Out4 and Out5 will work parallel with DIO, but OUT2 (PFI_28) reset, wenn I use DIO.

On the Counter Outputs we don't use the DIO.

I hope you can understand me .... 🙂

[Kevin_Price]

It sounds like you approached it right and it ought to work.  I can't think of much else to suggest except general troubleshooting.  For example, can you try configuring and wiring to use Ctr3 Out instead of Ctr2?  It looks like PFI24 / DIO24 is similarly unused.

When does Ctr2 reset?  Is it when you first start the DIO task?  How have you specified your DIO virtual channel(s)?  Can you post your code -- when I get a chance I can try to replicate the problem.

-Kevin P.

[Traxx]

Ok, so i write a little step by step .....

First 1 call the example VI "Gen Dig Pulse Train-Continous.vi" and select ctr0 and start the VI.

Second I start the "test_DO.vi" (see Atachment) and start this. The Counter ctr0 will work fine.

If I do this with ctr2, the signal stops, wenn I wirte to DIO.

[Kevin_Price]

I wasn't able to replicate the problem.  On my system, Ctr2 continued running just like Ctr0.  Tough to guess what's going on with your system...

-Kevin P.

[Traxx]

I've replay the test, the Signal an ctr2 will always stop (I check it with the oszilloscop)

the VI is in runing mode, but the signal stops.

In the Attachment i have my configuration from MAX.

[Traxx]

No idea? anyone