Counter stuck at zero

Hi,
I'm using LabVIEW 2014 on Windows 64 bit to acquire displacement data from a digital encoder as follows: Renishaw linear encoder --> NI 9411 digital in --> cDAQ-9174 --> Windows machine.
I have a VI that records the displacement at 5000 Hz. It's been working fine for weeks but suddenly, the displacement value (i.e. the count) stays stuck at zero no matter how much displacement there is.
Displacement data is also being used in a SoftMotion feedback loop. That is working fine. I am even using SoftMotion commands to create a displacement history, which looks right (this displacement history is limited to low frequency activation by the nature of SoftMotion so I created this second way of measuring displacement to get to high frequency). Point being, I'm confident the linear encoder is working fine.
I am extremely puzzled because I haven't changed anything of substance that I can think of. I did switch the cDAQ9174 to a different USB cable os I started with the hypothesis that I had screwed up connectivity somewhere in hardware. The cDAQ 9174 and the NI 9411 both pass Self Test in NI MAX. I checked continuity of the relevant cable pin by pin and it is fine. Then I started trying to get more insight into the value of the counter. I have a number of versions of this VI and they all report that the counter is flatline at zero no matter how much displacement there is in the system. I ran the VI in highlight execution mode to look for clues and I spotted something that seems slightly odd, at least to me. The counter is identified as cDAQ1/_ctr*. Does anyone know what that means?
Attached are screenshots of the VI with and without highlight execution turned on in case anyone sees anything in there that I'm missing.
Thanks,
John

Hey John,
I didn't see anything strange in your screenshots. The cDAQ1/_ctr* just means that there are more characters following "_ctr", but by default highlight execution only includes 11 characters. You can see the same behavior in a few of your other constants.
When you changed USB cables, did you change any of the inputs to the 9411? Is everything still configured to match the Connections for Counters and 9411 specifications?

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Hi,
When a for-loop runs zero times, all outputs are 'undefined' (and should
be).
Besides, how would LV know what the output of a not executed routine should
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It might be handled differently in LV5 and LV6, which is unfortunate. In
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It's not a bug. It's just something that should be avoided in any LV
version.
> The solution is easy - I just have to connect the
> output of the outer loop to the data line BEFORE it enters the inner
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"Gabs" wrote in message
news:[email protected]...
> LabVIEW 6.1 If For Loop count terminal is zero then value going
> through the loop is not passed on to the output of the loop
>
> Hello, one of our customers just encountered an execution error in a
> vi running under LabVIEW 6.1, which doesn't exist under LabVIEW 5.1 or
> 6.01. I have a simple vi that has two encapsulated For Loops. Two
> string arrays go in, one goes out of the outer loop. Inside the outer
> loop the first array is indexed. The string which results from this
> indexing is compared with all other strings from the second string
> array in the inner loop. If it matches one of the strings of the
> second array, it is not outputted, otherwise this string goes through
> the inner For Loop to the output of the inner loop and from there to
> the output of the outer loop. The count terminal of the outer/inner
> loop is connected to the Array Size of the first/second string array.
> If the second array is empty, that means that the element in test from
> the first arry cannot match anything from the second array, so the
> element in test is send to the output of the inner loop and from there
> to the output of the outer loop. This works fine in LabVIEW 5.1 and
> 6.01, but NOT in LabVIEW 6.1. In LabVIEW 6.1 the inner loop is never
> executed if the count value is zero (which is correct), but the data
> line running through the loop is not executed either, which is
> different to what LabVIEW 5.1 and 6.01 do. There, the input string is
> sent to the output of the inner loop correctly even if the loop
> counter is zero. The solution is easy - I just have to connect the
> output of the outer loop to the data line BEFORE it enters the inner
> loop. But: I don't know if this is a LabVIEW 6.1 bug or if it is
> supposed to be a feature, but it brings some incompatibility in
> programming between the different LabVIEW versions.
> Best regards,
> Gabsi

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