Include timestamp FIFO high data rate

[Giuu]

Good afternoon, 

I'm working on a project where the system is implemented in a cRIO-9068 with 8 modules using Labview2019.

I need to acquire different modules at different data rate, at 10 kHz and 100 Hz using a FIFO. I set the acquisition with the TDMS and it is working at high data rate but the problem is related to the inclusion of a timestamp of each data acquired. I tried different methods but it seems as if the file cannot write time at the same speed as it writes data.

I can't use the function daqmx because it is not supported by my cRIO. 

Thank you in advance. 

[ZYOng]

I recommend NI CompactRIO Waveform Reference Library

[Giuu]

Thanks for the answer! I'll have a look to the new functions. 

By the way I have been able to add the starting moment of the acquisition with the wf start time in the tdms format. Do you know if there is a way to add also the wf end time? This would be a kind of work-around solution because I know the acquisition rate.

Thank you. 

[cordm]

Use the waveform data type to include t0, dt and other attributes like the channel name. This replaces your "to dynamic data".

This will set the wf_start_time and wf_increment in the TDMS file.(See here: TDMS File Format Internal Structure#Predefined Properties)

The waveform attributes will be written as TDMS properties.

write waveform to tdms

[ZYOng]

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@Giuu wrote:

Thanks for the answer! I'll have a look to the new functions. 

By the way I have been able to add the starting moment of the acquisition with the wf start time in the tdms format. Do you know if there is a way to add also the wf end time? This would be a kind of work-around solution because I know the acquisition rate.

Thank you. 

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You can't define end time directly. The end time is t0 + dt*([number of elements in Y] - 1). See Using the Waveform Data Type in LabVIEW to understand more about this data type.