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Error -50150 "Cascade Failure": LabVIEW Bug?

Hello,
 
I'm new to the forums here, so I apologize in advance for breaches of etiquette or various other newbie actions. ;)
 
While using the DAQmx Create Channel VI in conjuction with my own custom unit scale, I keep running into a -50150 error for various combinations of slope and y-intercept. I've pared my problem down to the attached VI. As you can see, I'm setting up the linear scale with a slope and y-intercept, and then scaling the original +/- 10V range for an appropriate maximum and minimum. Upon running this VI as-is, I get the -50150 "cascade failure" error. However, changing the y-intercept value to an arbitrarily different value, say 6, causes the program to run fine.
 
I've noticed that other combinations of slope-intercept also crash the program, and that these combinations usually have a pattern. For example, the (m, b) combinations of
 
(100,5); (100,20); (100,30); (100,45); (100,55); (100,70); and so on, with the 10-15-10-15 pattern repeating
 
cause the program to throw -50150 as well. I have not found any values of the y-intercept that cause the program to crash that are not multiples of 5 (although obviously I cannot say conclusively that there are none). I realize that it is all very well for me to claim that this is a software bug and not my fault, but I cannot see any good reason for this to be happening in such an odd way.
 
I am running LabVIEW 8.2.1, DAQmx 8.5, WinXP SP2, Pentium 4 2.79 GHz, 768 MB of RAM. The hardware involved is an NI cDAQ-9172 chassis with NI 9205, 9263, 9211, and 9211 modules in slots 1, 2, 3, and 4, respectively. Thanks very much for your time.


Cascade.vi:
http://forums.ni.com/attachments/ni/170/262819/1/Cascade.vi
0
x9561 (148438)
8/1/2007 5:10:11 PM
comp.lang.labview 35210 articles. 1 followers. vasusachin24 (1) is leader. Post Follow

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Hello Paul,

This was reported to R&D (# 4C0IH7AH) for further investigation.
As a workaround, you can change the 10 and -10 limits to something very
near to 10 and -10, like 9.99999 and -9.99999. This seems to resolve
the issue and will result in basically the same limits. I have attached
a modified VI that demonstrates this change. Thanks for the feedback
Paul!


Cascade (Modified).vi:
http://forums.ni.com/attachments/ni/170/263227/1/Cascade (Modified).vi
0
x9561 (148438)
8/2/2007 10:10:10 PM
I think I was secretly hoping for a problem on my end; it seems to add more closure when someone tells me I am wrong. ;) Luckily, the posted workaround works fine for our purposes.
Thanks, Matt!
0
x9561 (148438)
8/3/2007 12:10:03 PM
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&quot;VI was stopped at node &quot; &quot; at a call to &quot;In Port Old 6.x.vi&quot;&quot;
Hi. I am having problems with&nbsp;a VI&nbsp;that was initially developed for LABView 6i. I have upgraded to LABView 8.2 but whenever I run the program in LABView 8.2 I get the error message that my VI was stopped at node&nbsp; " " at a call to "In Port Old 6.x.vi". The VI generally aquires data from a measurement instrument via an RS232 COM port. I have searched the forum and the only reference to this problem mentioned that it can be solved by making "minor modifications" to the polymorphic In Port VI in LABView 8.2 but I have no idea how to do this. &nbsp; I would be most grateful if anyone can help me to do this. I am a newbie to LABView programming so I would require as much detail as possible. Thanks. &nbsp; tronix Hello, &nbsp; Have you followed the guidelines found on this document? &nbsp; <a href="http://digital.ni.com/public.nsf/allkb/39129B46944215B686257069006CEC4E?OpenDocument" target="_blank">http://digital.ni.com/public.nsf/allkb/39129B46944215B686257069006CEC4E?OpenDocument</a> &nbsp; Contains information on how to proceed and how you can change the VI's needed to new ones. &nbsp; Hopes this helps! Hello. Thanks for your response. I did see the link. Part of the document says: tronix wrote: Hi. I am having problems with&nbsp;a VI&nbsp;that was initially developed for LABView 6i. I have upgraded to LABView 8.2 but whenever I run the program in L...

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