Error -200124 occurred at DAQmx Control Task.vi:3900002

[dzanella]

Hi,

i have a problem with simultaneous read and write digital input/output witch NI 9401 Module. 

The following error is occuring:

Error -200125 occurred at DAQmx Control Task.vi:3900003

Possible reason(s):

Lines 4 through 7 of this port are configured for output. Cannot configure these lines for input at this time.

Device: cDAQ1Mod1
Digital Port: 0

Task Name: IGN_READ

On this forum and in Labview Help i didn't find another similar problem or example able to help me.

You can find the attachment to view the vi file.

Thanks in advance

[GerdW]

Hi dzanella,

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@dzanella wrote:

i have a problem with simultaneous read and write digital input/output witch NI 9401 Module. 

The following error is occuring:

Error -200125 occurred at DAQmx Control Task.vi:3900003

Possible reason(s):

Lines 4 through 7 of this port are configured for output. Cannot configure these lines for input at this time.

Device: cDAQ1Mod1
Digital Port: 0

Task Name: IGN_READ

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The error description is quite clear: you cannot read from DO channels…

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@dzanella wrote:

You can find the attachment to view the vi file.

---

No, not yet…

[dzanella]

thanks for your respond, but even if i change to digital input the same error occur.

Now would be there the attachment

[GerdW]

Hi dzanella,

did you read the datasheet of the NI9401 (carefully)?

It only allows to set input/output in 2 groups of 4 channels per group! Right on the first page it says:

The eight DIO channels are grouped in two ports that you can configure independently for input or output.

You are trying to use

• channels 0:2 as output
• channels 3:4 as output
• channels 5:6 as input, but configured them as output…

So there are two failures:

1. defining channels as output, but trying to read from them!
2. defining channels 3+4 as output, but trying to configure channels 5+6 as input: this will not work because you try to use different settings (in/out) within the same port of channels 4:7!

More problems:

• Why are you creating channels using DAQmxCreateChannels, but then not using that task reference? Instead you use tasks defined in MAX, which are not available to us…
• Why do you use "one channel for all lines" setting, when you use boolean arrays later on to set your output channels?

[dzanella]

Sorry for the late response, i resolve the problem about the channels.

I use "one channels for al the lines" because i saw it in some example and in that way the program works, then I don't undestand what you mean about using task reference in my case

[GerdW]

Hi dzanella,

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@dzanella wrote:

I don't undestand what you mean about using task reference in my case

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This:

We don't know these DAQmx task references…

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@dzanella wrote:

Sorry for the late response, i resolve the problem about the channels.

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How did you do that? This forum works best, when you provide the solution to your problem…

[dzanella]

In IGN, FlameDet and IGN_READ tasks, i've just define the pins i use as input or output. Nothing else. Again, in that way the program works but i put this tasks when channles problem persisted so i don't know if i do in another way the program would work anyway