Why can I not set the transformation ratio parameter to a non-integer value in the xPC NAII 76CL1 LVDT emulator card Simulink block

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Kev Heaton
Kev Heaton 2014-7-1
评论： Kev Heaton 2014-7-9
I am running a real-time model of an actuator using xPC Target and emulating the position of an LVDT which is connected to the actuator using an NAII 76CL1 LVDT Emulator card. I am feeding in an external AC excitation signal set to 7Vrms.
It appears that the card is only accepting the integer part of the value I am typing in for the Transformation ratio as I get no change in output if the TR is anywhere between 1.0 and 1.9. However, if I enter 2, the output is twice as large as the output when the TR was set to 1, as you'd expect.
If I set a TR value that is less than 1.0, the outputs are all set to zero and the D2 BIT status seems to report an error (I say "seems to" as I don't really know how to debug the status of the D2 BIT tests as neither the card documentation nor the MatLab help file explain it particularly well). The status that is reported is [3, 0, 0].
If anyone has used this card and understands what is going on here I would very much appreciate your help. Likewise if you have had this problem or not, it would be good to hear about it.
Many Thanks.

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Gordon Weast
Gordon Weast 2014-7-2
You found a bug. I can have a fix for you once you tell me which version of Matlab you're using.
It is usually easier to work through MathWorks tech support when you have a real bug like this.
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Gordon Weast
Gordon Weast 2014-7-7
I've just posted a fix to the bug report database. See: http://www.mathworks.com/support/bugreports/search_results?utf8=%E2%9C%93&search_executed=1&keyword=&release_filter=Exists+in&release=240&selected_products=2679&commit=Search
The bug number is 1112598. That one came up at the top of the list when I just did a search.
This is just a fix to the driver for the board to avoid truncating the ratio. Once you unpack the zip file, you only need to rebuild your model. Please verify that it works for you.
Kev Heaton
Kev Heaton 2014-7-9
Hi Gordon,
We have implemented the fix and it works perfectly. Thanks for your help on this. We are now ready to begin testing of our product.
Regards,
Kev

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