Simulink Analog Input Block Size limitation with NI DAQ card

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MatrixMichael
MatrixMichael am 17 Mär. 2012
Kommentiert: Rajesh Raveendran am 11 Feb. 2020
Hello,
I'm trying to extract a single channel signal waveform from my NI DAQ 6211 in Simulink using the Analog Input block in Asynchronous mode. By default the Block Size property is set to 2 which leads to extraction of 2 waveforms based on output of only one Hardware channel in a manner similar to a demultiplication (however, unwated in this case). I understand that to get a single waveform the Block Size property should be set to 1. However, when trying to do so I get an Configuraion Error saying that 2 is the smallest value for Block Size property. (This is not the case with the winsound0 sound card as input for example).
Is there a workaround to this problem or do I have to manipulate with the "demultiplexed" data to put it back into a single time array order? If so, how can I do this in Simulink in a least CPU consuming manner?
Kind regards
Michael
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Philip Wang
Philip Wang am 28 Sep. 2015
Hi,
Can you explain a little more into the details? I am actually encountering the same problem with the PCI-6034E device.
Instead of trying to reduce the block size, I increase it to my sampling rate and run the data acquisition for one second.
I thought this would work but I end up having an strange array which has a third index.
In other word, I was trying to get data(1,1) but end up getting things like data(1,1,2)...
Don't know what's my real signal now...
Rajesh Raveendran
Rajesh Raveendran am 11 Feb. 2020
Hello,
Even I have the same issue, I just need one signal (1x1) instead of a block of data (2x1). Any ways to make it back to data I originally expect?

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