We are looking for alternatives for NI DAQ devices for industrial automation. Since NI has its devices mostly focused on advanced/high speed/high precison data acquisition/processing its prices are inadequate to simple automation tasks.
I would also say that NI PC based daq systems are expensive if need to be distributed systems (found this but still relatively expensive cRIO required).
Just now we need to extend our compactDAQ based system with two DIO modules. We even have free chassis slots for this, but station that needs this IOs is few meters away from PC. How easier would it be if we could use single ethernet cable.. Ofcourse we can add another small cDAQ (what we probably going to do) but this is slightly expensive solution for our customer.
Does anyone have some experience with 3rd party solutions? Any known daq devices vendors? Standalone ethernet daq modules?
i have a question in basic understanding of update rate sample rate samples per buffer and cycles per buffer.
i have DAQ 6343 and electronic circuit.
i'm using AO0 for generation sine wave at these frequencies 10Hz, 100Hz, 500Hz, 1kHz, 3kHz this signal enters to electronic circuit.
and after conversion i must to measure two outputs of this circuit by AI2 and AI3.
from my understanding of tech spec of the daq analog output update rate is 900kS/s and analog input update rate is 500kS/s
as i understand if i have freq = 3kHz the maximum sample rate per buffer is 300 samples
and if i have freq = 10Hz i can generate this signal with 90000 samples per buffer?
for analog input the formula is the same?
that meaning of cycles per buffer?
which sample rate of AI i need to setup to measure data fast and accurately?
thanks for answers
I am trying to implement a simple DAQ Watchdog with single digital output but cannot find any logical way to reset the Watchdog timeout signal. One of obvious solutions is invoking DAQmx Reset Device.vi. Unfortunately, it does not work. The Watchdog goes to timeout state but the physical output signal does not turn to High.
For some obscure reason (typical non-qualified guess:) I added bottom part of the code that is red-framed in the BD. The only difference between functional and non-functional code is using DAQmx Start Task.vi, that is located in â€œSolutionâ€-driven case structure. If Boolean control â€œSolutionâ€ is True, the code works; if False, it doesnâ€™t.
Please help to understand why launching conventional Digital Output task is necessary for normal functioning of the Watchdog?
PS: Attempts to use clear expiration command instead of DAQmx Reset Device.vi were not successful.
PSS: HW is PXIe-6358
PSSS: Unfortunately, I cannot post any image here. Any image format results in "You are not allowed to use that image extension on this community" . The VI is attached.
I have created a vi that controls multiple writes (individually) by a switch. I have it so one individual switch controls one individual write (And is linked to individual clear, stop, error daqmx blocks). I do not think this is efficient as it takes about 4-6 seconds for the switch to actually write (True or False).
So, I was wondering if someone could help me make my code more efficient so it would run a bit faster.
Digital Outs fine.vi
I think this topic is very important for everybody that are doing advanced DAQ. Because it you want to save an event, you need first to see it(real time analysis), and than to save the transition how the event happened(that means to have values, before the event happened). Using consumer producer structure.
i'm trying to save data into some kind of buffer. my main goal is to delay values. I successfully created a delay using Delay values.vi, the problem is i think it makes the while loop slower. If anyone knows what is a good practice to create a delay for large amounts of samples 100k, 200k, 300k samples? Is a delay values.vi good practice, or is there another better way?