I want to order two relays, but Labview says that I have something wrong with my VI
Of the image, I have 2 control relays, they are the two toggle switch type, I want to control at the same time, but fail to do so.
I already have digital > channels > single sample 1 > Boolean (1 line per channel) and before I run it, I choose the channel 0 and 1 in the front panel
When I run it, the program does not give error, however, I use a voltmeter to test the voltage on ports 0 and 1, they are 5V and stabilize... which does not correspond to the VI I write
After you click stop, Labivew said:
read name or write operation failed because the number of rows in the data of a string is not the lines in the channel.
If you use the digital waveform data type, make sure that the number of lines in the digital waveforms is the number of lines in the channel. If you are using Boolean data, make sure that the dimension of the array for the rows of the data is the number of lines in the channel.
Number of lines in the channel: 8
Number of rows in the data : 1
Task name: _unnamedTask<4>4>
What is the problem with my VI? Thank you
He doesn't seem to like the layout of the table 1 d Boolean. It is not sensible.
But I found a way so that it will run without errors. I don't know without having a real DAQ hardware whether outputs will be correct.
1. change all DAQmx wrote on the Board of Boolean 2D, (N lines per channel). If Digital > multiple channels > sample > Boolean 2D.
2. change all the raster constants to add a dimension turning them into 2D Boolean tables.
Now, it will run without error. But if the output is correct or not, you need to test.
You said you want to control the relay. I don't know what kind of relay that you have, or is that your DAQ hardware, but take keeps most of the DAQ cards do not provide enough current to directly drive a relay.
Tags: NI Software
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