Hello, I am trying to turn on a relay which is connected to a pump and can switch it on and off via LabView. The board installed on my computer (PCIe-DIO96H) allows me to control the relay with LabView. I am trying to utilize the samples of "ULx Write Dig Chan" and "ULx Write Dig Port" provided by LabView software package, but I have not been successful yet. I am not clear on the difference between "Port", "Channel", "Line", and "sample" so I guess that's the reason that I have difficulties choosing the right option for "ULX Write.VI". Once I run the above code, I get this error message: Measurements: Write cannot be performed, because the number of channels in the data does not match the number of channels in the task. When writing, supply data for all channels in the task. Alternatively, modify the task to contain the same number of channels as the data written. Number of Channels in Task: 1Number of Channels in Data: 96 I was wondering how I could change the "Number of Channels in Task" to match with "Number of Channels in Data". Could anyone please help me understand the difference between the mentioned terms and modify the sample codes to achieve the mentioned purpose?Best Regsrds,Amirhossein

LabVIEW

Try the attached VI and let me know if it works. I did some change.

Make sure the number of relays used matches the number of DO that you set as shown in the screenshot below:

I tested this code with my hardware and it seems to work fine. By the way, I am using USB-TC-AI from MCC Daq.

I'm here to help; I find joy in helping.

~Don't forget to accept best solution if you get what you want ~

Message 11 of 11

(267 Views)